sea urchin
noun
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
Words nearby sea urchin
sea swallow,
sea tangle,
sea trials,
sea trout,
sea turtle,
sea urchin,
sea vegetable,
sea wall,
sea walnut,
sea wasp,
sea whip
Example sentences from the Web for sea urchin
British Dictionary definitions for sea urchin
sea urchin
noun
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