suilline adjective 1noun 1forms 3 adjective1 •Of or relating to the suborder Suina of (especially) pigs, peccaries, and hippopotami. noun1 •Any artiodactyl of the suborder Suina of pigs, peccaries, and hippopotami.The temporal fossa has a capacity in its proportions and form more resembling that of carnivores than that of the ordinary suillines. — 1869 formssuillines · more suilline · most suilline