秘āu put oân-tûn原音 (英語: close back unrounded vowel) 或者高āu put oân-tûn秒音 (英語: high back unrounded vowel)[1]是一寡口語內底使用的一種元音。國際音標內底大表這个音的符號是 ⟨ɯ⟩。咧排板頂懸是共 ⟨m⟩ 字母轉會來的 ⟨ɯ⟩,考慮著 ⟨ɯ⟩ 和字母 ⟨u⟩ 所代表的siañ音關係, ⟨ɯ⟩ 會當皇認為是加上家一个 "uáñ公 (u)" 的 ⟨污⟩。
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