From The Collaborative International Dictionary of English
v.0.48:  Vicinal \Vic"i*nal\ (?; 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.     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]
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