The Collaborative International Dictionary of English v.0.48:
Britisher \Brit"ish*er\, n. An Englishman; a subject or inhabitant of Great Britain, esp. one in the British military or naval service. [Now used jocosely] [1913 Webster]WordNet (r) 3.0 (2006):
Britisher n 1: a native or inhabitant of Great Britain [syn: Britisher, Briton, Brit]