Dictionary/密室みっしつMisshitsu密室 (Misshitsu) is a Japanese noun meaning “locked room, secret room”.Meaningsnounlocked roomnounsecret roomKanji in 密室密secrecy室roomRelated words秘密secret室room教室classroom研究室laboratory室長section chief密かsecret病室sickroom寝室bedroom機密secrecy室内indoor会議室conference room密売illicit sale