Lexic.us

Definition of Sea urchin

1. Noun. Shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells.

Definition of Sea urchin

1. Noun. Any of many marine echinoderms, of the class ''Echinoidea'', commonly found in shallow water, having a complex chewing structure named Aristotle's lantern ¹

¹ Source: wiktionary.com

Medical Definition of Sea urchin

1. Any one of numerous species of echinoderms of the order Echinoidea. When living they are covered with movable spines which are often long and sharp. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Sea Urchin

Literary usage of Sea urchin

Below you will find example usage of this term as found in modern and/or classical literature:

1. The American Naturalist by American Society of Naturalists (1869)
"The sea-urchin, when dead and bleached upon the beach, forms a very curious object. A flattened spherical shell, composed of a large number of small plates, ..."

2. Biological Bulletin by Marine Biological Laboratory (Woods Hole, Mass.) (1916)
"AXIAL SUSCEPTIBILITY GRADIENTS¡IN THE EARLY DEVELOPMENT OF THE sea urchin. CM CHILD. (WITH 20 FIGURES.) Axial gradients in susceptibility to cyanides and ..."

3. International Catalogue of Scientific Literature by Royal Society (Great Britain) (1906)
"A method by which the egga of a sea-urchin ... The fertilization of the egg of the sea-urchin by the sperm of the star-fish. [Address before the Sigma Xi ..."

4. Behavior of the Lower Organisms by Herbert Spencer Jennings (1906)
"The spines of the sea urchin usually bend toward a spot on the surface of the body that is mechanically stimulated, as by a needle. ..."

5. Macmillan's Magazine by David Masson, George Grove, John Morley, Mowbray Morris (1868)
"He speaks of the frequency with which geologists find in the chalk a fossilized sea-urchin, to which is attached the lower valve of a Crania. ..."

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