1. coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes; [syn: Hydrozoa, class Hydrozoa]
WordNet (r) 3.0 (2006):
class Hydrozoa
n 1: coelenterates typically having alternation of generations;
hydroid phase is usually colonial giving rise to the
medusoid phase by budding: hydras and jellyfishes [syn:
Hydrozoa, class Hydrozoa]