hydroid n : colonial coelenterates having the polyp phase dominant [syn: hydrozoan]
- Of or pertaining to such creatures
Hydroid may refer to:
Marine BiologyHydroids are coral-like animals living in Antarctic seas (Ross sea, etc.).
BotanyIn 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.