Definition of Sea urchin

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

Generic synonyms: Echinoderm
Group relationships: Class Echinoidea, Echinoidea
Specialized synonyms: Echinus Esculentus, Edible Sea Urchin, Sand Dollar, Heart Urchin

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

sea titling
sea toad
sea toads
sea trial
sea trials
sea trifoly
sea trout
sea trumpet
sea trumpets
sea turn
sea turns
sea turtle
sea turtles
sea unicorn
sea unicorns
sea urchin
sea urchin granuloma
sea urchins
sea vegetable
sea wall
sea wasp
sea water
sea whip
sea whip coral
sea widgeon
sea willow
sea willows
sea wing
sea wolf
sea wood louse

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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