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View synonyms for hydroid

hydroid

[ hahy-droid ]

adjective

  1. noting or pertaining to that form of hydrozoan that is asexual and grows into branching colonies by budding.


noun

  1. the phase of a hydrozoan coelenterate that consists of polyp forms usually growing as an attached colony.

hydroid

/ ˈhaɪdrɔɪd /

adjective

  1. of or relating to the Hydroida, an order of colonial hydrozoan coelenterates that have the polyp phase dominant
  2. (of coelenterate colonies or individuals) having or consisting of hydra-like polyps


noun

  1. a hydroid colony or individual

hydroid

/ droid′ /

  1. Any of numerous, usually colonial marine cnidarians, having a polyp rather than a medusoid form as the dominant stage of the life cycle. Hydroids have a simple cylindrical body with a mouthlike opening surrounded by tentacles. Most species form colonies with individual hydroids branching off from a common hollow tube that is probably used to share ingested food. The young develop from eggs or from buds. The most well-known hydroids are the hydras (genus Hydra ), which are atypical in being both freshwater and solitary.


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Word History and Origins

Origin of hydroid1

First recorded in 1860–65; hydr(a) + -oid

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Word History and Origins

Origin of hydroid1

C19: from hydra + -oid

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Example Sentences

The image caption has also been updated to clarify that not all hydroid animals are coastal.

The illustration shows a plant on which the hydroid Sertularia pumila is growing.

A hydroid about one inch high, growing in patches and appearing like tufts of moss on rocks between tide-marks.

There are some species which, having no hydroid or strobila state, mature without alternation of generation (metagenesis).

This hydroid is found creeping over seaweeds in tide-pools from Long Island Sound northward.

The hydroid Hydractinia polyclina often covers the exterior of such shells with a brown, velvety growth.

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hydrographyhydrokinetic