Trachymedusae

1 definition found

From The Collaborative International Dictionary of English v.0.48 [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]