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Gymnochroa :: Gymnochroa (n. pl.) A division of Hydroidea including the hydra. See Hydra.

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..

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

Campanularian :: Campanularian (n.) A hydroid of the family ampanularidae, characterized by having the polyps or zooids inclosed in bell-shaped calicles or hydrothecae..

Tubulicole :: Tubulicole (n.) Any hydroid which has tubular chitinous stems.

Hydrocorallia :: Hydrocorallia (n. pl.) A division of Hydroidea, including those genera that secrete a stony coral, as Millepora and Stylaster. Two forms of zooids in life project from small pores in the coral and resemble those of other hydroids. See Millepora..

Medusoid :: Medusoid (a.) Like a medusa; having the fundamental structure of a medusa, but without a locomotive disk; -- said of the sessile gonophores of 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..

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..

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

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

Proliferous :: Proliferous (a.) Producing sexual zooids by budding; -- said of the blastostyle of a hydroid.

Graptolite :: Graptolite (n.) One of numerous species of slender and delicate fossils, of the genus Graptolites and allied genera, found in the Silurian rocks. They belong to an extinct group (Graptolithina) supposed to be hydroids..

Budding :: Budding (n.) A process of asexual reproduction, in which a new organism or cell is formed by a protrusion of a portion of the animal or vegetable organism, the bud thus formed sometimes remaining attached to the parent stalk or cell, at other times becoming free; gemmation. See 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..

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

Gemmipares :: Gemmipares (n. pl.) Animals which increase by budding, as hydroids..

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

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

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..

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