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The Collaborative International Dictionary
Plancher

Plancher \Planch"er\, n. [F., planche. See Planch.]

  1. A floor of wood; also, a plank. [Obs.]
    --Bacon.

  2. (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.