Definition of urchin

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

Lern More About 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.
Turban-shell :: Turban-shell (n.) A sea urchin when deprived of its spines; -- popularly so called from a fancied resemblance to a turban.
Urchin :: Urchin (n.) A mischievous elf supposed sometimes to take the form a hedgehog.
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..
Galerite :: Galerite (n.) A cretaceous fossil sea urchin of the genus Galerites.
Churching :: Churching (p. pr. & vb. n.) of Churc.
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.
Tow-head :: Tow-head (n.) An urchin who has soft, whitish hair..
Scrobicula :: Scrobicula (n.) One of the smooth areas surrounding the tubercles of a sea urchin.
Micraster :: Micraster (n.) A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows..
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..
Corona :: Corona (n.) The shelly skeleton of a sea urchin.
Semita :: Semita (n.) A fasciole of a spatangoid sea urchin.
Petalosticha :: Petalosticha (n. pl.) An order of Echini, including the irregular sea urchins, as the spatangoids. See Spatangoid..
Urchin :: Urchin (n.) A hedgehog.
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..
Pluteus :: Pluteus (n.) The free-swimming larva of sea urchins and ophiurans, having several long stiff processes inclosing calcareous rods..
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..
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