carb I. \ˈkärb, -ȧb\noun (-s) Etymology: by shortening slang: carburetor II. \ˈkärb\noun orcar·bo\ˈkärˌbō\ (-s) Etymology: by shortening : carbohydrate ; also : a high-carbohydrate food — usually used in plural < munching out on carbos — Cyra McFadden >