Definition of vegetarian:
(n) :
a person who does not eat
animal flesh, or in some cases, no animal products. There are several subcategories, see "related terms" below; an animal that eats only plants, a
herbivore
"vegetarian - that's an old Indian word for 'lousy hunter.' — Andy Rooney"
(adj) :
of or relating to the type of diet eaten by vegetarians (in all senses)