Meaning: ますいn. (Kanji=魔睡) (Pathology) anesthesia, loss of sensationn. (Kanji=麻睡,麻酔) (Pathology) anesthesia, lack of feeling, loss of sensation (caused by disease); (Medicine) localized or general reduction of sensitivity to pain (through drugs)n. (Kata=マスイ, Kanji=増井) Masui, Japanese family name