Troilus \Tro"i*lus\, n.; pl. L. Troili, E. Troiluses. [NL., fr. L. Troilus, Gr. ?, the son of Priam.]

(Zo["o]l.) A large, handsome American butterfly (Euph[oe]ades, or Papilio, troilus). It is black, with yellow marginal spots on the front wings, and blue spots on the rear wings.

Source: Webster's Revised Unabridged Dictionary (1913)