Open English Wordnet
Nouns
(n)lacto-ovo vegetarianism, ovo-lacto vegetarianisma diet that consists primarily of foods of vegetable origin but also includes some animal products, such as eggs (ovo), milk, and cheese (lacto), but no meat, fish, or poultry.“Ovo-Lacto vegetarianism is the most popular style of vegetarianism in the United States, while Lacto is the most popular worldwide.”