Echinoidea
noun plural
Ech·i·noi·dea
ˌek-ə-ˈnȯi-dē-ə 
: a class of motile bottom-dwelling echinoderms comprising the sea urchins and related forms
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“Echinoidea.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Echinoidea. Accessed 26 Dec. 2024.
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