actinism Actiniomorpha • Actinistia · · · Info · Definitions · Characters · · actinism · · Text Latin · · Script 8 · · Length Definitions · · · (noun) the property of radiation that enables it to produce photochemical effects. · · Noun Definition 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E s latin small letter s U+0073 t latin small letter t U+0074