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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..

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..

Churching :: Churching (p. pr. & vb. n.) of Churc.

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

Church :: Church (v. t.) To bless according to a prescribed form, or to unite with in publicly returning thanks in church, as after deliverance from the dangers of childbirth; as, the churching of women..

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

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

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

Aristotle's Lantern :: Aristotle's lantern () The five united jaws and accessory ossicles of certain sea urchins.

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

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..

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..

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

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..

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..

Urchin :: Urchin (a.) Rough; pricking; piercing.

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

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

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.

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