grasseater

noun3

1. •
   A herbivore or similar grazing animal.

   • And most of those grasseaters like horses, ox, camels, and llamas had shown early appearance on earth and since its early Cainozoic. — 2010
2. •
   (disapproving) A vegetarian or vegan.

   • Founded in 1898, when vegetarians were regarded as “grasseaters,” this restaurant has more than proved its staying power. — 2009
3. •
   (slang, offensive) A white person, especially an Irishman.

   • When the "green mouths," as the impoverished Irish grasseaters were dubbed, entered the United States, they brought cholera, consumption, and typhus with them. — 2002