The Collaborative International Dictionary
Gymnochroa
Gymnochroa \Gym*noch"ro*a\ (j[i^]m*n[o^]k"r[-o]*[.a]), n. pl. [NL., fr. Gr. gymno`s naked + chro`a skin, body.] (Zo["o]l.) A division of Hydroidea including the hydra. See Hydra.