Meaning of sprung molding

sprung' mold"ing

Pronunciation: [key]
— Carpentry. Carpentry.
  1. a molded board, as one forming part of a cornice, placed diagonally and secured at the ends to two surfaces intersecting at a right angle. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.