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

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..

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

Spatangus :: Spatangus (n.) A genus of heart-shaped sea urchins belonging to the Spatangoidea.

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

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

Unkempt :: Unkempt (a.) Not combed; disheveled; as, an urchin with unkempt hair..

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..

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

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

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

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

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

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

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

Turban-shell :: Turban-shell (n.) A sea urchin when deprived of its spines; -- popularly so called from a fancied resemblance to a turban.

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.

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..

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..

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

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