Is “Vicinal” a Scrabble word?
Yes
VICINAL
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Vicinal
/ˈvɪsɪnəl/
adjective
1.Of or pertaining to a neighborhood; neighboring.
2.Describing identical atoms or groups attached to nearby (especially adjacent) atoms in a molecule.
3.Describing subordinate planes on a crystal, which are very near to the fundamental planes in angles, and sometimes take their place.