活かっ性せい酸さん素そMeaningsNoun1. reactive oxygen (i.e. free radicals, which can be destructive at high concentrations)Kanji used活activity性nature (of a person)酸acid素elementaryPitch accentかっせいさんそComposed of活かっ性せいactivity; activeNoun酸さん素そoxygen (O)Noun