Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various echinoderms of the class Echinoidea, having a soft body enclosed in a round, symmetrical, calcareous shell covered with long spines.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of many marine echinoderms, of the class Echinoidea, commonly found in shallow water, having a complex chewing structure named Aristotle's lantern

from the GNU version of the Collaborative International Dictionary of English

  • Any one of numerous species of echinoderms of the order Echinoidea.

from The Century Dictionary and Cyclopedia

  • n. An echinoid; any member of the Echinoidea; a sea-egg or seahedgehog.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells

Etymologies

sea + urchin (meaning hedgehog), due to the similarity in appearance to the hedgehog. (Wiktionary)

Examples

  • FIGURE 9.3 Schematic drawing of a developmental gene regulatory network for sea urchin endomesoderm.

    The Edge of Evolution

  • Kernels in general can be expected to have a degree of complexity similar to that for sea urchin endomesoderm, so we can infer that other kernels also were designed.

    The Edge of Evolution

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