Vocabulary What does アミノ酸 (アミノさん, aminosan) mean? アミノ酸 (アミノさん, aminosan) means amino acid. Quick factsReadingアミノさんRomajiaminosanPart of speechnoun アミノ酸アミノさんaminosanamino acid1noun amino acidKanji in this word酸acid; sour; bitter, sorrowful