hidrat

1. colloq. (usually ugljeni hidrati) carbohydrate; carb
   Pokušavam da smanjim hidrate. — I'm trying to cut down on carbs.
   Testenina ima mnogo ugljenih hidrata. — Pasta has a lot of carbohydrates.
2. (in chemistry) hydrate
   Plavi kamen je hidrat bakar-sulfata. — Blue vitriol is a hydrate of copper sulfate.

In everyday talk about diet, "hidrati" is a colloquial clipping of "ugljeni hidrati" (carbohydrates); the basic chemical meaning is "hydrate".