Tro·i·lus n.; pl. L. Troili E. Troiluses 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.
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Tro·i·lus butterfly 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.
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