refractometer refractivity • refractometric · · · Info · Definitions · Characters · · refractometer · · Text Latin · · Script 13 · · Length Definitions · · · (noun) measuring instrument for measuring the refractive index of a substance. · · Noun Definition 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 f latin small letter f U+0066 m latin small letter m U+006D o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074