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
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
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012