actinometer actinomeris alternifolia • actinometric · · · Info · Definitions · Characters · · actinometer · · Text Latin · · Script 11 · · Length 5 · · Syllables Definitions · · · (noun) an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect). · · 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 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074