Entry 3 senses · 2 variants Webster, 1913 Plancher · Planch·er · IPA n. v. t. 01 n. A floor of wood; also, a plank. 1. A floor of wood; also, a plank.[Obs.] 2. The under side of a cornice; a soffit.(Arch.) 02 v. t. To form of planks. 1. To form of planks.[Obs.]