Vegetarian: This term describes someone who does not consume poultry, meat, seafood or fish.
Semi-Vegetarian: A person who consumes dairy products, poultry (including eggs) and fish, but does not eat any other animal flesh or products.
Ovo-Lacto-Vegetarian: Someone who eats eggs and milk, but does not consume any other animal products.
Ovo-Vegetarian: A person who consumes eggs but no other animal products or flesh.
Lacto-Vegetarian: Someone who consumes milk but no other animal products or flesh.
Vegan: Vegans do not consume any animal flesh, products or by-products. Some vegans also do not consume yeast or honey, and often opt not to wear clothing and accessories made from animals.
And from Today's Dietitian: Defending Vegan Diets — RDs Aim to Clear Up Common Misconceptions About Vegan Diets
"Andrea Giancoli, MPH, RD, a California-based spokesperson for the American Dietetic Association, is what she calls a “pesca-vegan.” She eats fish but no meat, eggs, or dairy."Pesca-Vegan. Aren't those terms mutually exclusive? Is she clearing up the misconception that vegans don't eat meat?
Mega-Vegan: A vegan who eats meat and eggs but no fish or dairy.
Daffy-Vegan: A vegan who eats dairy and fish, but no meat and eggs.
Mega-Daffy-Vegan: A vegan who eats, meat, eggs, dairy and fish but no poultry.