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ca r|bon fo ot|print N‑COUNT [oft poss N ] Your carbon footprint is a measure of the amount of carbon dioxide released into the atmosphere by your activities over a particular period. □  We all need to look for ways to reduce our carbon footprint.

ca r|bon mon|o x|ide N‑UNCOUNT Carbon monoxide is a poisonous gas that is produced especially by the engines of vehicles.

ca r|bon ne u|tral ADJ A carbon neutral lifestyle, company, or activity does not cause an increase in the overall amount of carbon dioxide in the atmosphere. □  More organizations are becoming carbon neutral.

ca r|bon tax (carbon taxes ) N‑COUNT A carbon tax is a tax on the burning of fuels such as coal, gas, and oil. Its aim is to reduce the amount of carbon dioxide released into the atmosphere.

ca r|bon tra d|ing N‑UNCOUNT Carbon trading is the practice of buying and selling the right to produce carbon dioxide emissions, so that people, countries or companies who use a lot of fuel and electricity can buy rights from those that do not use so much.

ca r boo t sale (car boot sales ) N‑COUNT A car boot sale is a sale where people sell things they own and do not want from a little stall or from the back of their car. [BRIT ] in AM, use garage sale

car|bun|cle /kɑː ^r bʌŋk ^ə l/ (carbuncles ) N‑COUNT A carbuncle is a large swelling under the skin.

car|bu|ret|tor /kɑː ^r bəre tə ^r , [AM ] -re I tə ^r / (carburettors ) in AM, use carburetor N‑COUNT A carburettor is the part of an engine, usually in a car, in which air and petrol are mixed together to form a vapour which can be burned.

car|cass /kɑː ^r kəs/ (carcasses ) in BRIT, also use carcase N‑COUNT A carcass is the body of a dead animal. □ [+ of ] A cluster of vultures crouched on the carcass of a dead buffalo.

car|cino|gen /kɑː ^r s I nədʒ ^ə n, kɑː ^r s I nədʒen/ (carcinogens ) N‑COUNT A carcinogen is a substance which can cause cancer. [MEDICAL ]

car|cino|gen|ic /kɑː ^r s I nədʒe n I k/ ADJ A substance that is carcinogenic is likely to cause cancer. [MEDICAL ]

car|ci|no|ma /kɑː ^r s I noʊ mə/ (carcinomas )

1 N‑UNCOUNT Carcinoma is a type of cancer. [MEDICAL ]

2 N‑COUNT Carcinomas are malignant tumours. [MEDICAL ]

card ◆◆◇ /kɑː ^r d/ (cards )

1 N‑COUNT A card is a piece of stiff paper or thin cardboard on which something is written or printed. □  Check the numbers below against the numbers on your card.

2 N‑COUNT [usu n N ] A card is a piece of cardboard or plastic, or a small document, which shows information about you and which you carry with you, for example to prove your identity. □  They check my bag and press card. □  …her membership card. □  The authorities have begun to issue ration cards.

3 N‑COUNT A card is a rectangular piece of plastic, issued by a bank, company, or shop, which you can use to buy things or obtain money. □  He paid the whole bill with an American Express card. □  Holiday-makers should beware of using plastic cards in foreign cash dispensers.

4 N‑COUNT A card is a folded piece of stiff paper with a picture and sometimes a message printed on it, which you send to someone on a special occasion. □  She sends me a card on my birthday. □  …millions of get-well cards.

5 N‑COUNT A card is the same as a postcard . □  Send your details on a card to the following address.

6 N‑COUNT [oft poss N ] A card is a piece of thin cardboard carried by someone such as a business person in order to give to other people. A card shows the name, address, telephone number, and other details of the person who carries it. [BUSINESS ] □  Here's my card. You may need me.

7 N‑COUNT [usu pl] Cards are thin pieces of cardboard with numbers or pictures printed on them which are used to play various games. □  …a pack of cards.

8 N‑UNCOUNT If you are playing cards , you are playing a game using cards. □  A group of officers was sitting round a table in the sun playing cards.