1. One who lives wholly or principally upon vegetable foods: A vegetarian is a person who on principle abstains from any form of animal food, or at least such as is obtained by the direct destruction of animal life.

Vegans strictly adhere to this regimen, but other vegetarians also consume eggs (ovovegetarians), or dairy products (lactovegetarians, or both (ovolactovegetarians).

2. Animals that live on vegetables.
3. Consisting of vegetables or plants.