'Trachymedusae' definitions:

Definition of 'Trachymedusae'

From: GCIDE

Trachymedusae \Tra`chy*me*du"sae\, n. pl. [NL., fr.Gr. ? rough + medusa.] (Zool.) A division of acalephs in which the development is direct from the eggs, without a hydroid stage. Some of the species are parasitic on other medusae. [1913 Webster]