There are many variations of the vegetarian diet: an ovo-lacto vegetarian diet includes both eggs and dairy products, an ovo-vegetarian diet includes eggs but not dairy products, and a lacto-vegetarian diet includes dairy products but not eggs. As the strictest of vegetarian diets, a vegan diet excludes all animal products

From The Vegetarian Society

A vegetarian diet can include…

Vegetables and fruits

Grains and pulses

Nuts and seeds

Eggs

Dairy products

Honey

A vegetarian diet does not include…

Meat or poultry

Fish or seafood

Insects

Gelatine or animal rennet

Stock or fat from animals

From Merriam-Webster: 1: a person who does not eat meat : someone whose diet consists wholly of vegetables, fruits, grains, nuts, and sometimes eggs or dairy products