According to the Vegetarian Society, a vegetarian is someone who lives on a diet of grains ... shellfish or by-products of slaughter. Lacto-ovo vegetarian: a vegetarian who eats dairy products ...

vegans (who eat only plant-based foods), lacto-vegetarians (who eat an entirely plant-based diet except for dairy), ovo-vegetarians (who eat an entirely plant-based diet except for eggs), lacto ...