Vegetarian
来自Big Physics
mid 19th century: formed irregularly from vegetable + -arian.
wiktionary
vegetable + -arian; popularized following 1847 foundation of British Vegetarian Society.
etymonline
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).
