光こう学がく機き械かいMeaningsNoun1. optical instrumentOther spellings光こう学がく器き械かいUsage share unknownKanji used光ray学study機machine械contraptionKanji in other spellings器instrumentPitch accentこうがくきかいこうがくきかいComposed of光こう学がくopticsNoun機き械かいmachine; mechanism; instrument; appliance; apparatusNoun