hydroid
English Thesaurus
1. colonial coelenterates having the polyp phase dominant (noun.animal)
| hypernym | : | cnidarian, coelenterate, |
| definition | : | radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms (noun.animal) |
| hyponym | : | planula, |
| definition | : | the flat ciliated free-swimming larva of hydrozoan coelenterates (noun.animal) |
| hyponym | : | hydra, |
| definition | : | small tubular solitary freshwater hydrozoan polyp (noun.animal) |
| hyponym | : | siphonophore, |
| definition | : | a floating or swimming oceanic colony of polyps often transparent or showily colored (noun.animal) |
| hyponym | : | sertularian, |
| definition | : | feathery colony of long-branched stems bearing stalkless paired polyps (noun.animal) |
| member meronym | : | class hydrozoa, hydrozoa, |
| definition | : | coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes (noun.animal) |
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