📖 R — The English dictionary · page 2

radiance — Everyday, meaning 1: Radiance is bright light shining out from something.↗ Everyday, meaning 2: Radiance is a happy, glowing look on a face.↗ Example: The moon gave a silver radiance.↗ · Her face shone with radiance.↗ · The pearl glittered with a fine radiance.↗

radiant — Everyday, meaning 1: Shining brightly; giving off light or warmth.↗ Everyday, meaning 2: (of a person) Looking very happy, healthy or beautiful, as if glowing.↗ Everyday, meaning 3: (science) Sent out as rays: radiant heat, radiant energy.↗ Example: The bride looked radiant in her white dress.↗ · She gave me a radiant smile.↗ · The radiant sun warmed the beach.↗ · The fire gave off radiant heat.↗ · Radiant energy from the Sun reaches the Earth in about eight minutes.↗ · Her face was radiant with happiness when she won.↗ · The king's castle was surrounded by lofty towers, and radiant light streamed from all the windows.↗ · They looked unto Him, and were radiant; and their faces shall never be abashed.↗ (Writings PSA.34.6, JPS 1917)↗ · Then thou shalt see and be radiant, and thy heart shall throb and be enlarged; because the abundance of the sea shall be turned unto thee, the wealth of the nations shall come unto thee.↗ (Prophets ISA.60.5, JPS 1917)↗

radiation — Everyday, meaning 1: Radiation is energy that travels as invisible waves or tiny particles, like light, heat, X-rays and radio waves.↗ Everyday, meaning 2: Radiation often means the dangerous kind given off by radioactive things, which can harm living things in large amounts.↗ Everyday, meaning 3: Radiation is a medical treatment for some cancers that uses strong rays.↗ Example: The Sun's heat reaches us by radiation.↗ · UV radiation from the sun can burn your skin.↗ · X-rays are a kind of radiation.↗ · A fire warms you by radiation.↗ · The sign warned of radiation danger.↗ · Her aunt had radiation treatment in hospital.↗ · Mobile phones use radio waves, a weak radiation.↗ · Dark clothes absorb more radiation from the sun.↗

radiator — Everyday, meaning 1: A radiator is a flat metal heater, usually under a window, that warms a room when hot water or steam flows through it.↗ Everyday, meaning 2: A radiator is also the part at the front of a car engine that keeps the engine cool.↗ Example: Put your wet gloves on the radiator to dry.↗ · The radiator in our classroom is very hot, so don't lean on it.↗ · Dad bled the radiator because it was cold at the top.↗ · Warm air rises from the radiator and moves round the room.↗ · The car stopped because the radiator leaked.↗ · Turn the radiator down; it's boiling in here.↗ · The cat loves sleeping on the radiator shelf.↗ · Our old house has big iron radiators.↗

radical — Everyday, meaning 1: Very big and basic, changing the most important parts of something: a radical change.↗ Everyday, meaning 2: Having very strong or extreme ideas about how society or politics should change.↗ Everyday, meaning 3: (noun) A person with extreme political ideas.↗ Everyday, meaning 4: (maths) To do with roots, such as the square root sign √, which is called the radical sign.↗ Everyday, meaning 5: (science) A free radical is an atom or group of atoms with an unpaired electron, which reacts easily.↗ Everyday, meaning 6: (slang, US, dated) Really cool or amazing — "Radical, dude!".↗ Example: The new head teacher made radical changes to the timetable.↗ · Moving from the city to a farm was a radical change for our family.↗ · Some radicals wanted to get rid of the king.↗ · In maths, the radical sign √ means "square root of".↗ · √25 is called a radical expression, and it equals 5.↗ · "That skateboard trick was radical!" shouted the surfer dude.↗ · Her idea to have no homework at all seemed radical to the teachers.↗ · The Fifth Path is called the Radical Intelligence, because it is itself the essence equal to the Unity, uniting itself to the BINAH or Intelligence which emanates from the primordial depths of Wisdom or CHOCHMAH.↗ (Sefer Yetzirah, Westcott 1887)↗

radio — Everyday, meaning 1: A radio is a machine that receives sounds sent through the air by electric waves, so you can listen to music, news and talk.↗ Everyday, meaning 2: The radio is the programmes broadcast this way.↗ Everyday, meaning 3: Radio is a way of sending messages by invisible waves, used by pilots, police and ships.↗ Everyday, meaning 4: To radio someone is to send them a message by radio.↗ Example: Dad listens to the news on the radio.↗ · Turn the radio down, please.↗ · My favourite song came on the radio.↗ · The pilot radioed the control tower.↗ · Radio waves travel through space.↗ · We lost radio contact with the boat.↗ · Keep a wind-up radio for emergencies.↗

radioactive — Everyday, meaning 1: Something radioactive gives off strong, invisible energy called radiation because the centres of its atoms are breaking apart.↗ Everyday, meaning 2: (informal, joking) Radioactive can describe something so unpopular or dangerous that everyone stays away from it.↗ Example: Uranium is radioactive.↗ · Marie Curie studied radioactive elements.↗ · Radioactive waste must be stored safely for thousands of years.↗ · The area around Chernobyl is still radioactive.↗ · Doctors use radioactive substances to find and treat illnesses.↗ · You cannot see, hear or smell radiation, so workers wear special badges to measure it.↗ · In comics, a radioactive spider gave Peter Parker his powers.↗ · After the scandal, the singer was radioactive — no company would hire him.↗ (informal)↗

radioactivity — Everyday, meaning 1: Radioactivity is the giving off of invisible energy, called radiation, by the centres (nuclei) of some unstable atoms as they break down.↗ Everyday, meaning 2: Radioactivity is also a measure of how much of this radiation something gives off.↗ Example: Marie Curie studied radioactivity and discovered radium and polonium.↗ · A Geiger counter clicks when it detects radioactivity.↗ · High levels of radioactivity can damage living cells.↗ · Bananas have a tiny, harmless amount of radioactivity.↗ · After the Chernobyl accident, radioactivity spread over a wide area.↗ · Scientists use radioactivity to date very old objects.↗ · The yellow warning sign means radioactivity is present.↗

radiocarbon — Everyday, meaning 1: (science) A kind of carbon, called carbon-14, that is slightly radioactive and slowly breaks down over thousands of years.↗ Everyday, meaning 2: (adjective) Using carbon-14 to find out how old something is: «radiocarbon dating».↗ Example: Radiocarbon dating showed the wooden boat was 3,000 years old.↗ · Scientists used radiocarbon to date the bones in the cave.↗ · Radiocarbon dating only works on things that were once alive.↗ · The Shroud of Turin was tested by radiocarbon dating in 1988.↗ · You cannot use radiocarbon to date dinosaur bones; they are far too old.↗ · Half of the radiocarbon in a sample breaks down in about 5,730 years.↗

radiograph — Everyday, meaning 1: A radiograph is an X-ray picture of the inside of the body or an object.↗ Example: The radiograph showed a broken bone.↗ · The dentist took a radiograph of my teeth.↗ · A radiographer takes radiographs in the hospital.↗ · (everyday) I had an X-ray of my arm.↗ · The radiograph showed a coin in the dog's stomach.↗ · The doctor studied the radiograph.↗ · Radiographs show bones as white shapes.↗ · Museums use radiographs to look inside old paintings.↗

radiographic — Everyday, meaning 1: (medicine, science) To do with X-ray pictures and other images of the inside of the body or objects: «a radiographic image of the knee».↗ Everyday, meaning 2: Made using X-rays: «a radiographic test of a metal pipe».↗ Example: The radiographic image showed a small crack in the bone.↗ · The dentist took radiographic pictures of my teeth.↗ · Engineers did a radiographic check of the bridge's welds.↗ · Radiographic evidence showed the statue had a hidden metal rod inside.↗ · A radiographer is trained to take radiographic images safely.↗ · The vet looked at radiographic pictures of the dog's leg.↗

radish — Everyday, meaning 1: A radish is a small crunchy root vegetable, often red outside and white inside, with a hot peppery taste, usually eaten raw in salads.↗ Example: We grew radishes in the school garden.↗ · The radish tasted hot and peppery.↗ · Radishes grow quickly.↗ · Mum sliced radishes into the salad.↗ · A radish is a root you can eat.↗ · Our radish seeds sprouted in three days.↗ · First he ate some lettuces and some French beans; and then he ate some radishes;↗

radium — Everyday, meaning 1: A rare, radioactive metal element (symbol Ra) that gives off dangerous radiation and glows faintly in the dark.↗ Example: Marie Curie discovered radium with her husband Pierre.↗ · Radium glows with a faint blue-green light.↗ · Radium is radioactive, so it is very dangerous to touch.↗ · Old watches had radium paint so you could read them in the dark.↗ · The Radium Girls got ill from licking their paintbrushes.↗ · Radium's symbol in the periodic table is Ra.↗

radius — Everyday, meaning 1: (maths) A straight line from the centre of a circle to its edge, or the length of that line.↗ Everyday, meaning 2: A distance around a place in every direction: «within a 5-mile radius».↗ Everyday, meaning 3: (body) One of the two bones in the forearm, on the thumb side.↗ Example: The radius of this circle is 4 cm, so the diameter is 8 cm.↗ · Draw a circle with a radius of 3 cm using a compass.↗ · All pupils living within a two-mile radius can walk to school.↗ · He broke his radius when he fell off the trampoline.↗ · The radius goes from the centre to the edge.↗ · A circle's area is π times the radius squared.↗

raf — Everyday, meaning 1: (abbreviation) The RAF: the Royal Air Force, the air force of the United Kingdom, founded in 1918.↗ Everyday, meaning 2: (Australia, NZ, Canada) RAAF, RNZAF and RCAF are the Royal Australian, New Zealand and Canadian Air Forces, named in the same way.↗ Example: My great-grandad flew Spitfires in the RAF.↗ · The RAF won the Battle of Britain in 1940.↗ · The Red Arrows are the RAF's display team.↗ · There is an RAF base near our town.↗ · She joined the RAF as an engineer.↗ · Winston Churchill praised the RAF pilots as «the few».↗

raffle — Everyday, meaning 1: A way of raising money where people buy numbered tickets and winning tickets are drawn to get prizes.↗ Everyday, meaning 2: (verb) To offer something as a raffle prize.↗ Example: I bought three raffle tickets at the school fair.↗ · Gran won a hamper in the raffle.↗ · The club raffled a bike to raise money.↗ · The raffle will be drawn at four o'clock.↗ · Tickets cost £1 each, or five for £4.↗ · If 200 tickets are sold and I have 4, my chance is 4 out of 200.↗

raft — Everyday, meaning 1: A raft is a flat floating platform, often made of logs, planks or barrels tied together, used to travel on water.↗ Everyday, meaning 2: A raft is also an inflatable rubber boat.↗ Everyday, meaning 3: A raft of things means a large number of them.↗ Everyday, meaning 4: To raft means to travel on a raft, especially down a river (rafting).↗ Example: They built a raft from logs and rope.↗ · Our lolly-stick raft held twenty coins before it sank.↗ · The sailors climbed into the life raft.↗ · We went rafting down the river with a guide.↗ · Always wear a life jacket on a raft.↗ · The council announced a raft of new ideas.↗ · A raft of ducks floated on the pond.↗ · Dorothy sat down in the middle of the raft and held Toto in her arms.↗

rafter — Everyday, meaning 1: One of the long sloping beams of wood that hold up a roof.↗ Everyday, meaning 2: (phrase) «packed to the rafters» = completely full of people or things.↗ Example: Swallows built a nest in the rafters of the barn.↗ · Hams and bunches of herbs hung from the rafters.↗ · The hall was packed to the rafters for the concert.↗ · We could see the old wooden rafters in the attic.↗ · An owl sat on a rafter, watching.↗ · The builders fixed new rafters on the roof.↗ · I looked down between the bare rafters and through the open loft into the comfortless space below.↗ · By slothfulness the rafters sink in; and through idleness of the hands the house leaketh.↗ (Writings ECC.10.18, JPS 1917)↗

rafts — Everyday, meaning 1: Rafts is more than one raft: flat floating platforms or rubber boats.↗ Everyday, meaning 2: «Rafts of» can mean lots of.↗ Everyday, meaning 3: «He rafts» means he travels on a raft.↗ Example: The teams raced their rafts across the lake.↗ · Each group built rafts from straws and tape.↗ · The ship carried enough life rafts for everyone.↗ · Rafts drifted slowly down the river.↗ · Which of the rafts held the most marbles?↗ · My uncle rafts down rivers every summer.↗ · Let us make several rafts, and carry them to a suitable place.↗

rag — Everyday, meaning 1: A rag is a piece of old cloth used for cleaning or wiping.↗ Everyday, meaning 2: Rags are old, torn clothes.↗ Everyday, meaning 3: (informal) A rag is a newspaper of poor quality.↗ Everyday, meaning 4: (UK informal) To rag someone is to tease them.↗ Everyday, meaning 5: (US slang) «On the rag» is a rude way to talk about a period; avoid it.↗ Example: Wipe the paint off with a rag.↗ · The poor boy was dressed in rags.↗ · It's a rags to riches story.↗ · Dad used an oily rag to clean the bike.↗ · (UK) Don't lose your rag over a game.↗ · Saying that to her is like a red rag to a bull.↗ · (informal) Grandad called the newspaper a rag.↗ · (UK) The older boys ragged him about his haircut.↗ · It was indeed poverty arrayed in rags.↗ · For the drunkard and the glutton shall come to poverty; and drowsiness shall clothe a man with rags.↗ (Writings PRO.23.21, JPS 1917)↗ · But I know thy sitting down, and thy going out, and thy coming in, and thy raging against Me.↗ (Prophets 2KI.19.27, JPS 1917)↗ · So they took up Jonah, and cast him forth into the sea; and the sea ceased from its raging.↗ (Prophets JON.1.15, JPS 1917)↗