† phaometerObs.|feɪˈɒmɪtə(r)| [f.Gr. ϕάος light + -meter.] An apparatus for determining the intensity of light; a photometer. 1747Phil.Trans. XLIV. 495 M. de Buffon, being asked if it might be possible to invent a Phaometer, or Machine for measuring the Intensity of Light.