prep the governor of a country or province who rules in the name of the sovereign with regal authority, as the king's substitute; as, the viceroy of india.
2. viceroy ·prep a large and handsome american butterfly (basilarchia, / limenitis, archippus). its wings are orange-red, with black lines along the nervures and a row of white spots along the outer margins. the larvae feed on willow, poplar, and apple trees.