Etymology
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vegetarian (n.)

1839, irregular formation from vegetable (n.) + -arian, as in agrarian, etc. "The general use of the word appears to have been largely due to the formation of the Vegetarian Society in Ramsgate in 1847" [OED]. As an adjective from 1849. An earlier adjective was anti-carnivorous (1828).

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Definitions of vegetarian

vegetarian (n.)
eater of fruits and grains and nuts; someone who eats no meat or fish or (often) any animal products;
From wordnet.princeton.edu