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