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

Scrobicula :: Scrobicula (n.) One of the smooth areas surrounding the tubercles of a sea urchin.
Pluteus :: Pluteus (n.) The free-swimming larva of sea urchins and ophiurans, having several long stiff processes inclosing calcareous rods..
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..
Urchon :: Urchon (n.) The urchin, or hedgehog..
Semita :: Semita (n.) A fasciole of a spatangoid sea urchin.
Urchin :: Urchin (n.) 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..
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..
Aristotle's Lantern :: Aristotle's lantern () The five united jaws and accessory ossicles of certain sea urchins.
Fasciole :: Fasciole (n.) A band of minute tubercles, bearing modified spines, on the shells of spatangoid sea urchins. See Spatangoidea..
Repkie :: Repkie (n.) Any edible sea urchin.
Siphon :: Siphon (n.) A tubular organ connected both with the esophagus and the intestine of certain sea urchins and annelids.
Jewstone :: Jewstone (n.) A large clavate spine of a fossil sea urchin.
Coronal :: Coronal (a.) Of or pertaining to the shell of a sea urchin.
Galerite :: Galerite (n.) A cretaceous fossil sea urchin of the genus Galerites.
Micraster :: Micraster (n.) A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows..
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..
Urchin :: Urchin (n.) A sea urchin. See Sea urchin.
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..
Spatangus :: Spatangus (n.) A genus of heart-shaped sea urchins belonging to the Spatangoidea.
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