Bible Dictionaries
Echinoidea
Webster's Dictionary
(n. pl.) The class Echinodermata which includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid.
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Bibliography Information
Webster, Noah. Entry for 'Echinoidea'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/e/echinoidea.html. 1828.