Definition of echinoid in English:


Syllabification: echi·noid
Pronunciation: /iˈkīˌnoid, ˈekəˌnoid


  • An echinoderm of the class Echinoidea; a sea urchin.
    More example sentences
    • Fossils include foraminiferans, brachiopods, echinoids, pelecypods, cephalopods, shark teeth, fish vertebrae, as well as asteroids, gastropods, a pterosaur, a nodosaurid, and decapods.
    • We have interpreted it as a synapomorphy for asteroids, ophiuroids, echinoids, and holothuroids, to the exclusion of the crinoids.
    • Sponges are preyed upon by gastropods, polychaetes, asteroids, echinoids, turtles, and fishes.


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  • Relating to or denoting echinoids.
    More example sentences
    • Seven horizons of echinoid aggregations, totaling approximately 3 % of the channel thickness, occur in the black shale.
    • In the echinoid gene order, the tRNA gene cluster follows the putative control region.
    • This implies that the ancestral polarity of the 4.6-kb inversion is the echinoid pattern.

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a small amount; a little