Definition of vicinal in English:


Line breaks: vi|cinal
Pronunciation: /ˈvɪsɪn(ə)l
, vɪˈsʌɪn(ə)l


  • 1 rare Neighbouring; adjacent.
  • 1.1 Chemistry Relating to or denoting substituents attached to adjacent atoms in a ring or chain.
    More example sentences
    • The epoxide hydrolases are a family of enzymes that hydrate simple epoxide to vicinal diols and arene oxides to transdihydrodiols.
    • The latter are also called vicinal diols, or 1,2-diols.
    • The number of vicinal hydroxyl groups corresponds to the chemical and biological activity of the compound; thus kaempferol is often less active than quercetin and myricetin.
  • 2(Of a railway or road) serving a neighbourhood; local.


early 17th century: from French, or from Latin vicinalis, from vicinus 'neighbour'.

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a small amount; a little