Definition of: viceroy

(vīs′roi) noun
1. One who rules a country, colony, or province by the authority of his sovereign or king.
2. A North American nymphalid butterfly (Basilarchia archippus), orange–red with black markings and a row of white marginal spots. The larva feeds on the willow, poplar, and certain other trees. [<MF viceroy, visroy <vice-, vis- in place (<L vice) + roy a king, ult. <L rex, regis]