eriometer
E`ri*om"e*ter, n. Etym: [Gr. -meter.] (Opt.) Defn: An instrument for measuring the diameters of minute particles or fibers, from the size of the colored rings produced by the diffraction of the light in which the objects are viewed.
E`ri*om"e*ter, n. Etym: [Gr. -meter.] (Opt.) Defn: An instrument for measuring the diameters of minute particles or fibers, from the size of the colored rings produced by the diffraction of the light in which the objects are viewed.