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 sea urchin is as below...

Regularia :: Regularia (n. pl.) A division of Echini which includes the circular, or regular, sea urchins..

Galerite :: Galerite (n.) A cretaceous fossil sea urchin of the genus Galerites.

Sea Hedgehog :: Sea hedgehog () A sea urchin.

Sea Urchin :: Sea urchin () Any one of numerous species of echinoderms of the order Echinoidea.

Sea Egg :: Sea egg () A sea urchin.

Paleechinoidea :: Paleechinoidea (n. pl.) An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palaeechini.

Micraster :: Micraster (n.) A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows..

Fasciole :: Fasciole (n.) A band of minute tubercles, bearing modified spines, on the shells of spatangoid sea urchins. See Spatangoidea..

Corona :: Corona (n.) The shelly skeleton of a sea urchin.

Petalosticha :: Petalosticha (n. pl.) An order of Echini, including the irregular sea urchins, as the spatangoids. See Spatangoid..

Semita :: Semita (n.) A fasciole of a spatangoid sea urchin.

Lithophagous :: Lithophagous (a.) Eating or destroying stone; -- applied to various animals which make burrows in stone, as many bivalve mollusks, certain sponges, annelids, and sea urchins. See Lithodomus..

Urchin :: Urchin (n.) A sea urchin. See Sea urchin.

Echinus :: Echinus (n.) A name sometimes given to the egg and anchor or egg and dart molding, because that ornament is often identified with Roman Doric capital. The name probably alludes to the shape of the shell of the sea urchin..

Pluteus :: Pluteus (n.) The free-swimming larva of sea urchins and ophiurans, having several long stiff processes inclosing calcareous rods..

Sphaeridium :: Sphaeridium (n.) A peculiar sense organ found upon the exterior of most kinds of sea urchins, and consisting of an oval or sherical head surmounting a short pedicel. It is generally supposed to be an olfactory organ..

Rosette :: Rosette (n.) Any structure having a flowerlike form; especially, the group of five broad ambulacra on the upper side of the spatangoid and clypeastroid sea urchins. See Illust. of Spicule, and Sand dollar, under Sand..

Echinus :: Echinus (n.) A genus of echinoderms, including the common edible sea urchin of Europe..

Auricula :: Auricula (n.) One of the five arched processes of the shell around the jaws of a sea urchin.

Spatangoidea :: Spatangoidea (n. pl.) An order of irregular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side..

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