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A sea urchin. See Sea urchin.

Any one of numerous species of echinoderms of the order Echinoidea.

The five united jaws and accessory ossicles of certain sea urchins.

One of the five arched processes of the shell around the jaws of a sea urchin.

ake of soap; an ague cake. Cakes of rusting ice come rolling down the flood. Dryden. Cake urchin (Zoöl), any species of flat sea urchins belonging to the Clypeastroidea. -- Oil cake the refuse of flax seed, cotton seed, or other vegetable substance from which oil has been expressed, compacted into a solid mass, and us…

eturning thanks in church, as after deliverance from the dangers of childbirth; as, the churching of women.

Like or related to the genus Clupeaster; -- applied to a group of flattened sea urchins, with a rosette of pores on the upper side.

The shelly skeleton of a sea urchin.

Of or pertaining to the shell of a sea urchin. Coronal suture (Anat.), a suture extending across the skull between the parietal and frontal bones; the frontoparietal suture.

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. [Written also Echinidea, and Echinoida.]

A genus of echinoderms, including the common edible sea urchin of Europe.

A little elf or urchin. Shenstone.

A band of minute tubercles, bearing modified spines, on the shells of spatangoid sea urchins. See Spatangoidea.

A cretaceous fossil sea urchin of the genus Galerites.

A large clavate spine of a fossil sea urchin.

which make burrows in stone, as many bivalve mollusks, certain sponges, annelids, and sea urchins. See Lithodomus.

A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows.

r occuring in acicular crystals; -- called also aikinite. -- Needle shell (Zoöl.), a sea urchin. -- Needle spar (Min.), aragonite. -- Needle telegraph, a telegraph in which the signals are given by the deflections of a magnetic needle to the right or to the left of a certain position. -- Sea needle (Zoöl.), the gar…

A fairy; a goblin; an elf. [Obs.] "Like urchins, ouphes, and fairies." Shak.

An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palæechini. [Written also Palæechinoidea.]