GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Vicinal (?; 277), a. [L. vicinalis: cf. F. vicinal.]
   1. Near; vicine.  T. Warton.
   
   [1913 Webster]
   
   
   2. (Organic Chem.) Having the substituted groups on the same carbon atom.
   
   [PJC]
   
   Vicinal planes (Min.), subordinate planes on a crystal, which are very near to the fundamental planes in angles, and sometimes take their place. They have in general very complex symbols.
   
   [1913 Webster]