chiefly British English spelling of clamor (q.v.); for spelling, see -or. Related: Clamoured; clamouring; clamourous.
late 14c., from Old French clamor "call, cry, appeal, outcry" (12c., Modern French clameur), from Latin clamor "a shout, a loud call" (either friendly or hostile), from clamare "to cry out" (see claim (v.)).
late 14c., from clamor (n.). Related: Clamored; clamoring.