sweep–sec·ond hand noun \ˈswēp-ˌse-kənd-, -kənt-\
: a hand marking seconds on a timepiece mounted concentrically with the other hands and read from the same dial as the minute hand
First Known Use of SWEEP-SECOND HAND
Seen & Heard
What made you want to look up sweep-second hand? Please tell us where you read or heard it (including the quote, if possible).