suine noun3 •(strictly) An even-toed ungulate belonging to the taxonomic subfamily Suinae, which is comprised of modern pigs (genus Sus) and their close relatives, both living and extinct.Primitive suines appeared in the Eocene. — 1983 •(loosely) An even-toed ungulate belonging to the suborder Suina. •(rare) A buttery substitute usually made of suet or lard. formssuines