減光 げんこう Meanings Noun, する verb, Transitive, Intransitive light reduction; dimming of a light Noun, する verb, Intransitive extinction Kanji 減 decrease. Read as ゲン. 光 light. Read as コウ. Words containing 減光 減光フィルター (げんこうフィルター) neutral-density filter Jinuma: Japanese Dictionary · Word lists