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...

Tubularia :: Tubularia (n.) A genus of hydroids having large, naked, flowerlike hydranths at the summits of long, slender, usually simple, stems. The gonophores are small, and form clusters at the bases of the outer tentacles..

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

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

Polyperythrin :: Polyperythrin (n.) A coloring matter found in many simple Anthozoa and some hydroids.

Hydroid :: Hydroid (n.) One of the Hydroideas.

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..

Phylactocarp :: Phylactocarp (n.) A branch of a plumularian hydroid specially modified in structure for the protection of the gonothecae.

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

Thecophora :: Thecophora (n. pl.) A division of hydroids comprising those which have the hydranths in thecae and the gonophores in capsules. The campanularians and sertularians are examples. Called also Thecata. See Illust. under Hydroidea.

Spirant :: Spiralozooid (n.) One of the special defensive zooids of certain hydroids. They have the form of long, slender tentacles, and bear lasso cells..

Hydromedusa :: Hydromedusa (n.) Any medusa or jellyfish which is produced by budding from a hydroid. They are called also Craspedota, and naked-eyed medusae..

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..

Plumularia :: Plumularia (n.) Any hydroid belonging to Plumularia and other genera of the family Plumularidae. They generally grow in plumelike forms.

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..

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

Style :: Stylaster (n.) Any one of numerous species of delicate, usually pink, calcareous hydroid corals of the genus Stylaster..

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

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

Velum :: Velum (n.) The circular membrane that partially incloses the space beneath the umbrella of hydroid medusae.

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