Hydrozoa
— Navneord
– Engelsk
~ coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes
hydrozoan
— Navneord
– Engelsk
~ colonial coelenterates having the polyp phase dominant
Hydrus
— Navneord
– Engelsk
~ a constellation in the southern hemisphere near the south celestial pole