Vocabulary What does 肉眼 (にくがん, nikugan) mean? 肉眼 (にくがん, nikugan) means naked eye. Quick factsReadingにくがんRomajinikuganPart of speechnoun 肉眼にくがんnikugannaked eye1noun naked eye2noun the physical eyeKanji in this word肉meat眼eye, eyeball