Webster’s Revised Unabridged Dictionary · 1913
Troilus
Tro′i·lus (trō′ĭ·lŭs), n.; pl. L. Troili (#), E. Troiluses (#). [NL., fr. L. Troilus, Gr. Τρωίλος, the son of Priam.] (Zoöl.) A large, handsome American butterfly (Euphœades, or Papilio, troilus). It is black, with yellow marginal spots on the front wings, and blue spots on the rear wings.