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Exocycloida
plural noun
Ex·o·cy·cloi·da
\ˌek(ˌ)sōˌsīˈklȯidə\
Definition of Exocycloida
: an order of sea urchins comprising forms with the periproct posterior or oral in position and including the heart urchins and sand dollars
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Origin and Etymology of exocycloida
New Latin, from exo- + cycl- + -oida
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