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Hydrozoa British & World English

A class of coelenterates which includes hydras and Portuguese men-of-war. Many of them are colonial and some kinds have both polypoid and medusoid phases

Hydrozoa in fire coral British & World English

A colonial coral-like hydrozoan, the heavy external skeleton of which forms reefs. The polyps bear nematocysts which can inflict painful stings

Hydrozoa in obelia British & World English

A sedentary colonial coelenterate with upright branching stems bearing minute cups in which the polyps sit

Hydrozoa in Portuguese man-of-war British & World English

A floating colonial coelenterate with a number of polyps and a conspicuous float. It bears long tentacles which are able to inflict painful stings and occurs chiefly in warm seas

Hydrozoa in hydra British & World English

A minute freshwater coelenterate with a stalk-like tubular body and a ring of tentacles around the mouth

Hydrozoa in hydroid British & World English

A coelenterate of an order which includes the hydras. They are distinguished by the dominance of the polyp phase

Hydrozoa in hydrozoan British & World English

A coelenterate of the class Hydrozoa, such as a hydra or Portuguese man-of-war