- 1. n. pl. The class class="def-link" href="https://vividlex.com/word/echinodermata">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. Source: opted
- 2. n sea urchins and sand dollars Source: ecdict
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echinoidea
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urchinsechinodermatacalcareousclassclypeastroidcomposedcovereddisk-shapeddollarsincludeslessmovableplatessandspatangoidspheroidalspinestheyunited
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