Definition of phototachometer in English:

phototachometer

noun

  • An optical device for measuring the speed of rotation of a part.

Origin

Late 19th century (in an earlier sense). From photo- + tachometer.

Pronunciation

phototachometer

/ˌfəʊtəʊtaˈkɒmɪtə//ˌfəʊtəʊtəˈkɒmɪtə/