sweep-second

[ sweep-sek-uh nd ]
/ ˈswipˌsɛk ənd /

noun

(on a timepiece) a second hand that is a sweep hand.

Origin of sweep-second

First recorded in 1935–40
Also called sweep-second hand.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019