noun plural

Ech·​i·​noi·​dea ˌek-ə-ˈnȯi-dē-ə How to pronounce Echinoidea (audio)
: a class of motile bottom-dwelling echinoderms comprising the sea urchins and related forms
echinoid noun

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Cite this Entry

“Echinoidea.” Medical Dictionary, Merriam-Webster, Accessed 15 Jul. 2024.

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