vicinal

adjective

vic·​i·​nal ˈvi-sə-nəl 

ˈvi-snəl

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

Word History

Etymology

Latin vicinalis, from vicinus neighbor, from vicinus, adjective, neighboring

First Known Use

circa 1623, in the meaning defined at sense 1