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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Merriam-Webster unabridged
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