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Meaning of sea urchin

sea' ur"chin

Pronunciation: [key]
  1. 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.
  2. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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