ˌyüdəˈrīnə, -rēnə noun
Usage: capitalized
Etymology: New Latin, from Greek eudōros generous (from eu- + -dōros, from dōron gift) + New Latin -ina; akin to Greek didonai to give — more at date
: a genus related to Volvox and comprising flagellates that produce markedly anisogamous gametes and form spherical or ellipsoidal colonies