vic·i·nal | \ ˈvi-sə-nəl 
, ˈvi-snəl \
, ˈvi-snəl \Definition of vicinal
1 : of or relating to a limited district : local
2 : of, relating to, or substituted in adjacent sites in a molecule
a vicinal disulfide group
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Time Traveler for vicinal
The first known use of vicinal was circa 1623
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