late 13c., probably from O.N. hvirfla
"to go round, spin," related to hvirfill
"circle, ring, crown," and to O.E. hweorfan
"to turn" (see whir
is attested from 1520s, but O.E. had hwyrfepol
is mid-14c., probably on model of O.N. hvirfilvindr
is from mid-15c., of various toys. Whirlybird
"helicopter" is from 1951.