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

Urchin :: Urchin (n.) A hedgehog.

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

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

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..

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

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

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..

Tow-head :: Tow-head (n.) An urchin who has soft, whitish hair..

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

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

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

Regular :: Regular (a.) Having all the parts of the same kind alike in size and shape; as, a regular flower; a regular sea urchin..

Clypeastroid :: Clypeastroid (a.) Like or related to the genus Clupeaster; -- applied to a group of flattened sea urchins, with a rosette of pores on the upper side..

Urchin :: Urchin (n.) A pert or roguish child; -- now commonly used only of a boy.

Urchin :: Urchin (n.) A mischievous elf supposed sometimes to take the form a hedgehog.

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..

Piper :: Piper (n.) A sea urchin (Goniocidaris hystrix) having very long spines, native of both the American and European coasts..

Coronal :: Coronal (a.) Of or pertaining to the shell of a sea urchin.

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