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.

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

Origin of sea urchin

First recorded in 1585–95

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for sea urchin

Driesch has found that a tropism underlies the arrangement of the skeleton in the pluteus larvae of the sea-urchin.
Darwin and Modern Science|A.C. Seward and Others
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 the egg there hatches a tiny larva which does not at all resemble the parent starfish or sea-urchin.
Elementary Zoology, Second Edition|Vernon L. Kellogg
The sea-urchin can thus advance with ease, and even rapidity.
The Ocean World:|Louis Figuier

In the starfish we noted five ambulacral areas, one on the under side of each arm; similarly we find five in the sea-urchin.
Elementary Zoology, Second Edition|Vernon L. Kellogg

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

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

sea urchin

noun

Content related to sea urchin

Words nearby sea urchin

Origin of sea urchin

Examples from the Web for sea urchin

British Dictionary definitions for sea urchin

noun