(英語:Geminal)在化學中是指兩個官能團均連於同一原子(如碳)上,如偕二氯乙烷即是指1,1-二氯乙烷。命名法中可用gem-/偕-來表示,前者源於拉丁語詞彙gemini(雙胞胎[1])。

偕二醇一般是不穩定的。

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