Added 9 October 2026 stopwatch noun Categories: ThingsRare Words noun ! Definition from Wiktionary (CC BY-SA). More about stopwatch at Wordnik → Where our words come from → A timepiece designed to measure the amount of time elapsed between a particular time when activated and when the piece is deactivated. verb To time (something) by means of a stopwatch. Origin From stop + watch. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: clockwatchtimekeepingtimertimetimingchronographchronometermicrochronometer Back to today's word