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特許 権利維持 Tinnitus (/tɪˈnaɪtəs/ or /ˈtɪnɪtəs/; from the Latin tinnītus "ringing") is the perception of sound within the human ear ("ringing of the ears") when no external sound is present. Despite the origin of the name, "ringing" is only one of many sounds the person may perceive.