n.; pl. L. Troili E. Troiluses [ NL., fr. L. Troilus, Gr. &unr_;, the son of Priam. ] (Zool.) A large, handsome American butterfly (Euphœades troilus, or Papilio troilus). It is black, with yellow marginal spots on the front wings, and blue spots on the rear wings; -- also called troilus butterfly. [ 1913 Webster ]

A large American butterfly (Papilio troilus). It is black, with yellow marginal spots on the front wings, and blue on the rear; -- also called troilus. [ Webster 1913 Suppl. ]