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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..

Urchin :: Urchin (n.) One of a pair in a series of small card cylinders, arranged around a carding drum; -- so called from its fancied resemblance to the hedgehog..

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

Lurching :: Lurching (p. pr. & vb. n.) of Lurc.

Echinoidea :: Echinoidea (n. pl.) The class Echinodermata which includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid..

Scrobicula :: Scrobicula (n.) One of the smooth areas surrounding the tubercles of a sea urchin.

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

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

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

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

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

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..

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

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..

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..

Repkie :: Repkie (n.) Any edible sea urchin.

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

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

Jewstone :: Jewstone (n.) A large clavate spine of a fossil sea urchin.

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