光こう速そくTop 20000MeaningsNoun1. speed of lightKanji used光ray速fastPitch accentこうそくUsed in vocabulary光こう速そく度どspeed of lightNoun亜あ光こう速そくnear light speed; sublight speedNoun超ちょう光こう速そくfaster-than-light speed; super luminal speedNoun準じゅん光こう速そくnear-light speed; sub-light speed; speed approaching lightNoun