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geminal Line breaks: gem|in¦al
Pronunciation: /ˈdʒɛmɪn(ə)l/

Definition of geminal in English:


Denoting substituent atoms or groups, especially protons, attached to the same atom in a molecule.
Example sentences
  • Compounds in which two hydroxyl groups are attached to the same carbon atom (geminal diols) normally cannot be isolated.
  • The fellow doing it was down the hall from me in graduate school, and he was doing an obscure reaction which forms a geminal dinitrile, which themselves are rather obscure compounds.
  • Particularly in the pathological examination, we discovered that it could activate and proliferate cells in lymph follicles, geminal centre, paracortical zone and medullary cord of lymph nodes.


Example sentences
  • However, fluoro-amino acid derivatives have rarely been synthesized because of the inherent instability of the geminally halogenated amine moiety.
  • Although the anomeric effect was originally identified in pyranoid rings, its relevance to conformational analysis of geminally hetero-atom substituted carbon chains was immediately obvious.
  • One of these involves the properties of amides that are geminally substituted at nitrogen with two heteroatoms, so-called ‘Anomeric Amides’.


1960s: from Latin geminus 'twin' + -al.

Definition of geminal in:
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