A coelenterate of an order which includes the hydras. They are distinguished by the dominance of the polyp phase.
Order Hydroida, class Hydrozoa
- ‘Aside from its temporary and permanently resident fish, the underside is decorated with sponges, hydroids, tunicates, tube worms, cup corals and anemones.’
- ‘There were dense walls of soft corals, sponges, anemones and hydroids, nudibranchs, creepy-crawlies and lots of fish.’
- ‘On the walls are a riot of soft corals, sponges, hydroids and anemones in all shapes and sizes.’
- ‘The most numerous inhabitants are hydroids and copepods.’
- ‘Colonies may be mistaken for hydroids, corals, or even seaweeds.’
1Relating to coelenterates of the hydroid group.
- ‘He had shown that hydroid jellyfish known as naked-eyed medusae reproduce not only by spewing eggs, but also by asexual budding, which he found marvelous to behold.’
- ‘The hydroid tissues, in particular, are the general run of moss water storage cells and are probably only remotely related to the xylem of tracheophytes.’
- ‘Before long, similar green proteins were detected in many bioluminescent coelenterates including various medusae, apparently all luminescent hydroid polyps, and a few others.’
- ‘Along the tops of the walls and gullies are many small hydroid clumps which, in turn, attract a range of delicately coloured nudibranchs that feed on them.’
- 1.1another term for polypoid (sense 1)
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