variant of bright (adj.). It figures in English phonetic spelling reform from at least the late 19c.; as an advertiser's word it dates from at least 1905 ("Star-brite Metal Polish," made by the Star-Brite Company of Lancaster, Pa., U.S.).
Brit
Britain
Britannia
Britannic
britches
brite
British
Britisher
Briton
Brittany
brittle