viceroyPronunciation: /ˈvʌɪsrɔɪ/Definition of viceroy noun a ruler exercising authority in a colony on behalf of a sovereign. Derivatives viceroyalPronunciation: /-ˈrɔɪəl/ adjective viceroyship noun Origin: early 16th century: from archaic French, from vice- 'in place of' + roi 'king'viceroy in other Oxford dictionaries Definition of viceroy in the US English dictionary