Webster’s Revised Unabridged Dictionary · 1913
Metronome
Met′ro·nome (mĕt′rō·nōm), n. [Gr. μέτρον measure + νέμειν distribute, assign: cf. F. métronome, It. metronomo.] An instrument consisting of a short pendulum with a sliding weight. It is set in motion by clockwork, and serves to measure time in music.