单词 Hydrozoa 释义 ‖ Hydrozoa, n. pl. Zool.|hadrz|[mod.L. (Owen 1843), f. hydro- e, as combining form of hydra 6 + Gr. ῶ animal.]A class of Clenterate animals, chiefly marine, simple or more frequently compound, found in all parts of the world, and dif...