0 a watch that can be started and stopped in order to measure the exact time of an event, especially a sports event -- （尤指用于体育赛事的）秒表，跑表
All response times were recorded with a stopwatch, and the child was encouraged to name the stimuli as quickly and as carefully as possible.
I kept track of the accumulated face duration using a stopwatch.
Using this view, t might be a small reactive system that implements a stopwatch.
A stopwatch was used to record reaction times.
Both the shaking frequency and the trolley speed were constant to within 2 % and their mean values for any test were recorded by stopwatch.
Stopwatch in hand, he clocked fourteen successive bouts of intercourse at a rate of five seconds per act, with mere five-second intervals between acts.
Time from release of a cercaria until it crossed a 1 cm radius was measured in seconds using a stopwatch.
In these cases, a stopwatch was used to make 3 time measurements that were averaged for the final data report.
