viceroy
Concise Oxford English Dictionary © 2008 Oxford University Press:
viceroy /ˈvʌɪsrɔɪ/
▶noun a ruler exercising authority in a colony on behalf of a sovereign.
– derivatives
viceroyal adjective,
viceroyship noun.
viceroyal adjective,
viceroyship noun.
– origin C16: from archaic Fr., from vice- ‘in place of’ + roi ‘king’.
'viceroy' also found in these Oxford entries:

