In chemistry, the descriptor geminal () refers to the relationship between two atoms or functional groups that are attached to the same atom. A geminal diol, for example, is a diol (a molecule that has two alcohol functional groups) attached to the same carbon atom, as in methanediol. Also the shortened prefix gem may be applied to a chemical name to denote this relationship, as in a gem-dibromide for "geminal dibromide".
Article · 中文
偕（英语：Geminal）在化学中是指两个官能团均连于同一原子（如碳）上，如偕二氯乙烷即是指。命名法中可用gem-/偕-来表示，前者源于拉丁语词汇gemini（双胞胎）。 偕二醇一般是不稳定的。
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