The Collaborative International Dictionary of English v.0.48:

Vegetarian \Veg`e*ta"ri*an\, n.
   One who holds that vegetables and fruits are the only proper
   food for man. Strict vegetarians eat no meat, eggs, or milk,
   and are sometimes referred tro as vegans.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vegetarian \Veg`e*ta"ri*an\, a.
   Of or pertaining to vegetarianism; as, a vegetarian diet.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vegetarian
    n 1: eater of fruits and grains and nuts; someone who eats no
         meat or fish or (often) any animal products

Moby Thesaurus II by Grady Ward, 1.0:

128 Moby Thesaurus words for "vegetarian":
   Apostolic, Apostolici, Brillat-Savarin, Encratic, Encratite,
   Lenten, Lucullus, Pythagorean, Pythagorist, Rechabite, Shaker,
   Spartan, Stoic, abstainer, abstemious, abstinent, ascetic, banian,
   board-and-roomer, boarder, bon vivant, botanic, bulbous, cannibal,
   cannibalistic, carnivore, carnivorous, celibate, cereal, chaste,
   commensal, connoisseur of food, consumer, continent, dietetic,
   diner, diner-out, dining, eater, eater-out, eating, epicure,
   farinaceous, feeder, feeding, flesh-eater, flesh-eating,
   fruitarian, fruitlike, fruity, gastronome, gastronomic, glutton,
   gluttonous, gourmand, gourmet, grain-eater, grain-eating,
   graminivore, graminivorous, granivore, granivorous, grass-eating,
   gymnosophist, herbaceous, herbal, herbivore, herbivorous, herbose,
   herbous, herby, high liver, hungry mouth, hydropot, insect-eating,
   insectivorous, lactovegetarian, leguminose, leguminous, luncher,
   man-eater, man-eating, meat-eater, meat-eating, mensal, mouth,
   nephalist, nephalistic, nourishing, nutritious, omnivore,
   omnivorous, omophagist, omophagous, on the wagon, pantophagist,
   pantophagous, phytivorous, phytophage, phytophagous, picnicker,
   plant-eater, plant-eating, plantlike, postprandial, prandial,
   predacean, predacious, preprandial, radicated, radiciform,
   radicular, rhizoid, rootlike, sexually abstinent, sworn off,
   teetotal, teetotaler, teetotalist, trencherman, tuberous,
   vegetable, vegetable-eating, vegetal, vegetational, vegetative,
   water-drinker, weedy