牀母)是中古漢語三十六字母的一個聲母,屬正齒音全濁聲母。

三十六字母與切韻聲母

牀母由兩部分組成,二等韻部份稱爲「牀二」,對應了切韻音系崇母;三等韻部份分稱爲「牀三」,對應了常母(也有學者認爲是船母)。

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