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hydroid	<zoology> Related to, or resembling, the hydra; of or pertaining to the Hydroidea. One of the Hydroideas. Origin: Hydra. Source: Websters Dictionary (01 Mar 1998)
hydroidea	<zoology> An extensive order of Hydrozoa or Acalephae. Alternative forms: Hydroida. This order includes the hydras and the free-swimming hydromedusae, together with a great variety of marine attached hydroids, many of which grow up into large, elegantly branched forms, consisting of a vast number of zooids (hydranths, gonophores, etc), united by hollow stems. All the zooids of a colony are produced from one primary zooid, by successive buddings. The Siphonophora have also been included in this order by some writers. See Gymnoblastea, Hydromedusa, Gonosome, Gonotheca. Origin: NL. See Hydra, and -oid. Source: Websters Dictionary (01 Mar 1998)

hydroid

<zoology> Related to, or resembling, the hydra; of or pertaining to the Hydroidea.
One of the Hydroideas.
Origin: Hydra.
Source: Websters Dictionary
(01 Mar 1998)

hydroidea

<zoology> An extensive order of Hydrozoa or Acalephae.
Alternative forms: Hydroida.
This order includes the hydras and the free-swimming hydromedusae, together with a great variety of marine attached hydroids, many of which grow up into large, elegantly branched forms, consisting of a vast number of zooids (hydranths, gonophores, etc), united by hollow stems. All the zooids of a colony are produced from one primary zooid, by successive buddings. The Siphonophora have also been included in this order by some writers. See Gymnoblastea, Hydromedusa, Gonosome, Gonotheca.
Origin: NL. See Hydra, and -oid.
Source: Websters Dictionary
(01 Mar 1998)