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sea urchin

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.
a tall evergreen shrub or small tree, Hakea laurina, of Australia, having narrow leaves and dense, globe-shaped clusters of crimson flowers with long yellow stamens.
Origin of sea urchin
First recorded in 1585-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for sea urchin
Contemporary Examples
Historical Examples
  • He lowered his voice as if a sea urchin might hear and tattle.

    Her Father's Daughter Gene Stratton-Porter
  • I felt I had done well; my sea urchin was actually what I had imagined.

    Tongues of Conscience

    Robert Smythe Hichens
  • Why was it not possible to prove this fact for the eggs of the sea urchin?

  • The writer tried to decide this question in the egg of the sea urchin.

  • That a tree could possess this no one would suggest; that a sea urchin could possess it no one would be likely to contend.

  • Another one of her favorite foods was the sea urchin—that chestnut burr of the sea.

    Wild Folk

    Samuel Scoville
  • Five-days-old larv from a sea urchin (Strongylocentrotus purpuratus) and a starfish (Asterias) .

  • Not before the skeleton or mesenchyme is formed in the sea urchin egg is the influence of the nucleus noticeable.

  • Another egg placed under identical conditions will develop into a sea urchin, and another into an oyster.

British Dictionary definitions for sea urchin

sea urchin

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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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