Are yams and sweet potatoes the same?
dance performed to music in triple time, 1781, from German Waltzer, from walzen "to roll, dance," from Old High German walzan "to turn, roll," from Proto-Germanic *walt- (cf. Old Norse velta), from PIE root *wel- "to turn, revolve" (see volvox). Described in 1825 as "a riotous and indecent German dance."
1794, from waltz (n.). Meaning "to move nimbly" is recorded from 1862. Related: Waltzed; waltzing.