Source : Webster's Revised Unabridged Dictionary (1913)

Herbivora \Her*biv"o*ra\, n. pl. [NL., fr. L. herba herb +
   vorare to devour.] (Zo["o]l.)
   An extensive division of Mammalia. It formerly included the
   Proboscidea, Hyracoidea, Perissodactyla, and Artiodactyla,
   but by later writers it is generally restricted to the two
   latter groups (Ungulata). They feed almost exclusively upon
   vegetation.