interfacial

• POS: Adjective
• HYPHEN: in=ter=fa=cial

CIDE DICTIONARY

interfacial, a. 

•  Included between two plane surfaces or faces; as, an interfacial angle.  [1913 Webster]
•  Of or pertaining to an interface.  [PJC]

OXFORD DICTIONARY

interfacial, adj.
1 included between two faces of a crystal or other solid.
2 of or forming an interface.

Derivative

interfacially adv. (esp. in sense 2).