Trōĭlus, i, m., = Τρώϊλος,
a son of Priam , slain by Achilles , Verg. A. 1, 474; Plaut. Bacch. 4, 9, 30; 4, 9, 36; Hor. C. 2, 9, 16; Dict. Cret. 4, 9.
·noun A large, handsome American butterfly (Euph/ades, / Papilio, troilus). It is black, with yellow...
Webster's Dictionary of the English Language