I. in·ter·lin·ing “+|liniŋ noun
Etymology: Middle English, from gerund of interlinen, enterlinen to interline — more at interline
: interlineation
II. in·ter·lining “+ noun
Etymology: inter- + lining
1. : an inner lining (as of a coat or jacket) consisting of a warm or firm fabric shaped and sewn between the ordinary lining and the outside fabric
2. : any fabric used for making interlinings