carbohydrate noun definition in Diet topic from the Oxford Advanced Learner's Dictionary

carbohydrate

 noun: Diet topic
1 (informal carb) [countable, uncountable] a substance such as sugar or starch that consists of carbon, hydrogen and oxygen. Carbohydrates in food provide the body with energy and heat.2 carbohydrates (informal carbs) [plural] foods such as bread, potatoes and rice that contain a lot of carbohydrate I’m trying to cut down on carbohydrates.