Answer: architrave

AnswerCrossword Clue
ARCHITRAVEBeam resting on tops of columns.
architraveThe molded frame around a doorway or window
architraveA molding around the exterior of an arch
architrave(in classical architecture) A main beam resting across the tops of columns, specifically the lower third entablature
architravethe collective name for the various parts, jambs, lintels, etc, that surround a door or window