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From: Webster's Revised Unabridged Dictionary (1913)

 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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