Whig /wɪɡ/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Origin: Whiggamore 'member of a 17th-century Scottish group opposed to the king' (17-20 centuries) , probably from Scottish English whig 'to drive' + more 'horse, mare' ]
a member of a British political party of the 18th and early 19th centuries which wanted to limit royal power, and later became the Liberal Party