Webster’s Revised Unabridged Dictionary · 1913
Promethea
Pro·me′the·a (prō·mē′thē·ȧ), n. [NL. See Prometheus.] (Zoöl.) A large American bombycid moth (Callosamia promethea). Its larva feeds on the sassafras, wild cherry, and other trees, and suspends its cocoon from a branch by a silken band.