n. [ Gr. &unr_; to increase + -meter. ] (Optics) An instrument for measuring the magnifying power of a lens or system of lenses. [ Webster 1913 Suppl. ]
n. [ L. audire to hear + -meter. ] (Acous.) An instrument by which the power of hearing can be gauged and recorded on a scale. [ 1913 Webster ]
n. [ L. audire to hear + -meter. ] (Acous.) An instrument by which the power of hearing can be gauged and recorded on a scale. [ 1913 Webster ]