sea urchin

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sea urchin

n.
Any of various echinoderms of the class Echinoidea, having a soft body enclosed in a rounded, radially symmetrical, calcareous skeleton covered with long spines.

sea urchin

n
(Animals) any echinoderm of the class Echinoidea, such as Echinus esculentus (edible sea urchin), typically having a globular body enclosed in a rigid spiny test and occurring in shallow marine waters

sea′ ur`chin


n.
any echinoderm of the class Echinoidea, having a somewhat globular or discoid form and a shell composed of many calcareous plates covered with projecting spines.
[1585–95]

sea urchin

Any of various invertebrate sea animals having a round body covered by a shell with movable spines. Sea urchins are related to starfish.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.sea urchin - shallow-water echinoderms having soft bodies enclosed in thin spiny globular shellssea urchin - shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
echinoderm - marine invertebrates with tube feet and five-part radially symmetrical bodies
class Echinoidea, Echinoidea - sea urchins and sand dollars
Echinus esculentus, edible sea urchin - a sea urchin that can be eaten
sand dollar - flattened disklike sea urchins that live on sandy bottoms
heart urchin - sea urchin having a heart-shaped body in a rigid spiny shell
Translations
merisiili
hérisson de mer
קיפוד ים
tengeri sün
ígulker
zee-egel

sea urchin

nriccio di mare

sea urchin

n erizo de mar
References in classic literature ?
Weena, who had been rolling a sea urchin down the sloping glass of a case, presently came, as I stared about me, and very quietly took my hand and stood beside me.
His use of sea urchins as a model system for human cells is of particular interest.
For example, when they kidnapped the resident damselfish, other fish and sea urchins ate up the alga within days.
They were deemed such a threat that programs were undertaken to systematically eradicate sea urchins from California coastal waters.
The fishery is currently managed through limited entry, a restricted number of opportunity days, and sea urchin size limits, in which legal-size sea urchins have a test diameter between 52 mm and 76 mm.
Echinoderms, animals like sea urchins and starfish, carry a distinct gene known to scientists as the alkaline phosphatase gene that is believed to be responsible for developing a pre-skeletal system within the echinoderm, of which is later on replaced by calcium deposits to make the final skeleton.
A Shetland project aims to develop the farming of sea urchins.
Under the proposal, cables would be barred in areas where the ocean bed is thick with coral reef and teeming with lobsters, sponges, starfish, sea urchins and grouper.
A massive head with strong jaws help this nmarine reptile consume horseshoe crabs, crustaceans, sponges and sea urchins.
Putin and Mori agreed only to pursue joint economic activities there, including a marine farm for growing sea urchins and scallops.
Sea urchins are voracious algae eaters, and their absence caused a definite rise in algae.