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( PHYSICS ) dangerous energy that some substances send out High levels of radiation have been recorded near the nuclear power plant.

ra • di • a • tor / ' reidi,eitsr / noun [ count ]

a metal thing with hot water inside that makes a room warm

a part of a car that has water in it to keep the engine cold

rad • i•calaw / ' rredikl / В

(used about changes) very great; complete radical reforms in the welfare system

ra .di .0 © / ' reidiou / noun ( plural ra - di - os )

[ count ] a piece of equipment that brings voices or music from far away so that you can hear them

We heard the news on the radio . Can you turn on the radio ?

[ noncount ] ( PHYSICS ) sending or receiving sounds that travel a long way through the air by special waves

The captain of the ship sent a message by radio .

ra • di • o • ac • tive / ,reidiou ' ®ktiv / adjective ( PHYSICS ) sending out dangerous energy the disposal of radioactive waste

rad • ish / ' rredij / noun [ count ] ( plural rad • ish • es )

a small, red vegetable that is white inside and has a strong taste. You eat radishes in salads.

Look at the picture at vegetable .

ra • di • um / ' reidiam / noun [ noncount ] ( symbol Ra )

( CHEMISTRY ) a chemical substance that is used in the treatment of some serious diseases

ra • di • us / ' reidias / noun [ count ]

( plural ra • di • i / reidiai / )

( MATH ) the length of a straight line from the center of a circle to the outside

Look at the picture at circle . raf • fle / ' rrefl/ noun [ count ]

a way of making money for a charity by selling tickets with numbers on them. Later some numbers are chosen and the tickets with these numbers on them win prizes.

raft / rreft / noun [ count ] a flat boat with no sides and no engine

rag / rreg / noun

[ count ] a small piece of old cloth that you use for cleaning

rags [ plural ] clothes that are very old and torn She was dressed in rags .

rage / reid3 / noun [ count, noncount ]

very strong anger

He was trembling with rage.

raid / reid / noun [ count ]

a sudden attack on a place an air raid

► raid verb ( raids , raid • ing , raid • ed )

Police raided the house looking for drugs.

rail / reil / noun

[ count ] ( also rail • ing / ' reilig / ) a long piece of wood or metal that is fastened to the wall or to something else Hold onto the rail as you go up the stairs.

rails [ plural ] the long pieces of metal that trains go on

[ noncount ] trains as a way of traveling We decided to travel by rail .

rail • road / ' reilroud / noun [count]

the system of trains, metal lines that they go on, and companies that own them railroad tracks

rain lC¹/ rein/ noun [ noncount ]

the water that falls from the sky

rain 2 Ф / rein/ verb ( rains , rain ing , rained ) When it rains , water falls from the sky It's raining. It rained all day.

rain • bow / ' reinbou / noun [ count ]

a half circle of colors in the sky when rain and sun come together

rain • coat / ' reinkout / noun [ count ]

a light coat that you wear when it rains

rain • drop / ' reindrap / noun [ count ]

one drop of rain

rain • fall / ' reinfol / noun [ noncount ]

the total amount of rain that falls in a place

The average annual rainfall here is less than two inches.

rain for • est / ' rein forest / ( also rain • for • est ) noun [ count ]

a forest in a hot part of the world where there is a lot of rain the Amazon rain forest

rain • y / reini /adjective (rain • i • er , rain • i • est)

with a lot of rain a rainy day

raiS6 1 ©/ reiz / verb ( rais es, rais ing, raised )

to move something or someone up

Raise your hand if you want to ask a question.

—ANTONYM lower

to make something bigger, higher, stronger, etc. They raised the price of gas.

She raised her voice (= spoke more loudly ) .

—ANTONYM lower

to get money from other people for a particular purpose We raised $5,000 for the hospital.

to start to talk about something He raised an interesting question.