The Collaborative International Dictionary
Plancher
Plancher \Planch"er\, n. [F., planche. See Planch.]
A floor of wood; also, a plank. [Obs.]
--Bacon.(Arch.) The under side of a cornice; a soffit.
Plancher
Plancher \Planch"er\, v. t.
To form of planks. [Obs.]
--Golding.
Wiktionary
plancher
n. 1 A floor made of wood. 2 A plank. 3 (context architecture English) The underside of a cornice; a soffit. vb. (context obsolete English) To form using planks.