Webster’s Revised Unabridged Dictionary · 1913
Papilio
Pa·pil′i·o, n. [L., a butterfly.] (Zoöl.) A genus of butterflies.
☞ Formerly it included numerous species which are now placed in other genera. By many writers it is now restricted to the swallow-tailed butterflies, like Papilio polyxenes, or asterias, and related species.