AskDefine | Define hydroid

Dictionary Definition

hydroid n : colonial coelenterates having the polyp phase dominant [syn: hydrozoan]

User Contributed Dictionary

English

Noun

  1. Any of many colonial coelenterates that exist mainly as a polyp; a hydrozoan

Adjective

  1. Of or pertaining to such creatures

Extensive Definition

Hydroid may refer to:

Marine Biology

Hydroids are coral-like animals living in Antarctic seas (Ross sea, etc.).

Botany

In mosses, hydroids are water conducting tissues analogous to tracheids. However, they lack any pitting or surface texture.
Hydroids have been found in some Rhynie chert plants, including Aglaophyton, where they were initially mistaken for xylem vessels.

See also

  • Leptoid, a related sucrose-transporting vessel analogous the phloem of vascular plants

References

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