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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
1585-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for sea-urchin
Historical Examples
  • A sight that caused me to drop my shells, sea-urchin and all, as if they had been pieces of red-hot iron.

    The Boy Tar Mayne Reid
  • On my way to the front of the peninsula, I looked for “sea-urchin,” but none fell in my way.

    The Boy Tar Mayne Reid
  • From these larval stages the adult or fully developed starfish or sea-urchin develops by very great changes or metamorphoses.

  • The body of the sea-urchin is furnished with a species of spine.

    The Ocean World: Louis Figuier
  • To make things still more certain, he replaced the female nucleus with a male one from a different variety of sea-urchin.

    Taboo and Genetics Melvin Moses Knight, Iva Lowther Peters, and Phyllis Mary Blanchard
  • One of the most singular organs of the sea-urchin is its mouth.

    The Ocean World: Louis Figuier
  • Sub-kingdom IV, Echinodermata, a large number of marine animals, such as the star-fish and the sea-urchin.

  • The sea-urchin has evolved from the star by folding the arms into a ball.

    The Story of Evolution Joseph McCabe
  • And of migratory fish there are the purple-fish, the sweet purple-fish, the sea-urchin, the strobelus.

  • Then, using the sea-urchin as an interpreter, they questioned the starfish.

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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