Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of hydroid is as below...

Athecata :: Athecata (n. pl.) A division of Hydroidea in which the zooids are naked, or not inclosed in a capsule. See Tubularian..

Perisarc :: Perisarc (n.) The outer, hardened integument which covers most hydroids..

Polypite :: Polypite (n.) One of the feeding zooids, or polyps, of a coral, hydroid, or siphonophore; a hydranth. See Illust. of Campanularian..

Zoophyte :: Zoophyte (v. i.) Any one of numerous species of invertebrate animals which more or less resemble plants in appearance, or mode of growth, as the corals, gorgonians, sea anemones, hydroids, bryozoans, sponges, etc., especially any of those that form compound colonies having a branched or treelike form, as many corals and hydroids..

Entogastric :: Entogastric (a.) Pertaining to the interior of the stomach; -- applied to a mode of budding from the interior of the gastric cavity, in certain hydroids..

Hydrophora :: Hydrophora (n. pl.) The Hydroidea.

Gonosome :: Gonosome (n.) The reproductive zooids of a hydroid colony, collectively..

Polyp :: Polyp (n.) Same as Anthozoa. See Anthozoa, Madreporaria, Hydroid..

Craspedota :: Craspedota (n. pl.) The hydroid or naked-eyed medusae. See Hydroidea.

Periderm :: Periderm (n.) The hard outer covering of hydroids and other marine animals; the perisarc.

Gymnophthalmata :: Gymnophthalmata (n. pl.) A group of acalephs, including the naked-eyed medusae; the hydromedusae. Most of them are known to be the free-swimming progeny (gonophores) of hydroids..

Hydrozoa :: Hydrozoa (n. pl.) The Acalephae; one of the classes of coelenterates, including the Hydroidea, Discophora, and Siphonophora..

Acalephae :: Acalephae (n. pl.) A group of Coelenterata, including the Medusae or jellyfishes, and hydroids; -- so called from the stinging power they possess. Sometimes called sea nettles..

Sertularian :: Sertularian (n.) Any species of Sertularia, or of Sertularidae, a family of hydroids having branched chitinous stems and simple sessile hydrothecae. Also used adjectively..

Trophosome :: Trophosome (n.) The nutritive zooids of a hydroid, collectively, as distinguished from the gonosome, or reproductive zooids..

Tabula :: Tabula (n.) One of the transverse plants found in the calicles of certain corals and hydroids.

Hydranth :: Hydranth (n.) One of the nutritive zooids of a hydroid colony. Also applied to the proboscis or manubrium of a hydroid medusa. See Illust. of Hydroidea.

Meconidium :: Meconidium (n.) A kind of gonophore produced by hydroids of the genus Gonothyraea. It has tentacles, and otherwise resembles a free medusa, but remains attached by a pedicel..

Gonotheca :: Gonotheca (n.) A capsule developed on certain hydroids (Thecaphora), inclosing the blastostyle upon which the medusoid buds or gonophores are developed; -- called also gonangium, and teleophore. See Hydroidea, and Illust. of Campanularian..

Hydrina :: Hydrina (n. pl.) The group of hydroids to which the fresh-water hydras belong.

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