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...

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

Actinula :: Actinula (n. pl.) A kind of embryo of certain hydroids (Tubularia), having a stellate form..

Scyphistoma :: Scyphistoma (n.) The young attached larva of Discophora in the stage when it resembles a hydroid, or actinian..

Sertularia :: Sertularia (n.) A genus of delicate branching hydroids having small sessile hydrothecae along the sides of the branches.

Nematocalyx :: Nematocalyx (n.) One of a peculiar kind of cups, or calicles, found upon hydroids of the family Plumularidae. They contain nematocysts. See Plumularia..

Calicle :: Calicle (n.) One of the small cuplike cavities, often with elevated borders, covering the surface of most corals. Each is formed by a polyp. (b) One of the cuplike structures inclosing the zooids of certain hydroids. See Campanularian..

Millepore :: Millepore (n.) Any coral of the genus Millepora, having the surface nearly smooth, and perforated with very minute unequal pores, or cells. The animals are hydroids, not Anthozoa. See Hydrocorallia..

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..

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.

Palpocil :: Palpocil (n.) A minute soft filamentary process springing from the surface of certain hydroids and sponges.

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

Hydra :: Hydra (n.) Any small fresh-water hydroid of the genus Hydra, usually found attached to sticks, stones, etc., by a basal sucker..

Zooid :: Zooid (n.) One of the individual animals in a composite group, as of Anthozoa, Hydroidea, and Bryozoa; -- sometimes restricted to those individuals in which the mouth and digestive organs are not developed..

Theca :: Theca (n.) The chitinous cup which protects the hydranths of certain hydroids.

Tubularida :: Tubularida (n. pl.) An extensive division of Hydroidea; the tubularians; -- called also Athecata, Gymnoblastea, and Tubulariae..

Sea Ginger :: Sea ginger () A hydroid coral of the genus Millepora, especially M. alcicornis, of the West Indies and Florida. So called because it stings the tongue like ginger. See Illust. under Millepore..

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

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

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

Hydrosoma :: Hydrosoma (n.) All the zooids of a hydroid colony collectively, including the nutritive and reproductive zooids, and often other kinds..

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