The Collaborative International Dictionary of English v.0.48:

Pane \Pane\, n. [F. panne.]
   The narrow edge of a hammer head. See Peen.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pane \Pane\, n. [OE. pan part, portion of a thing, F. pan a
   skirt, lappet, part or piece of a wall, side, fr. L. pannus a
   cloth, fillet, rag; akin to E. vane. See Vane, and cf.
   Panel, Pawn pledge.]
   1. A division; a distinct piece, limited part, or compartment
      of any surface; a patch; hence, a square of a checkered or
      plaided pattern.
      [1913 Webster]

   2. One of the openings in a slashed garment, showing the
      bright colored silk, or the like, within; hence, the piece
      of colored or other stuff so shown.
      [1913 Webster]

   3. (Arch.)
      (a) A compartment of a surface, or a flat space; hence,
          one side or face of a building; as, an octagonal tower
          is said to have eight panes.
      (b) Especially, in modern use, the glass in one
          compartment of a window sash; a windowpane.
          [1913 Webster +PJC]

   4. In irrigating, a subdivision of an irrigated surface
      between a feeder and an outlet drain.
      [1913 Webster]

   5.
      (a) One of the flat surfaces, or facets, of any object
          having several sides.
      (b) One of the eight facets surrounding the table of a
          brilliant cut diamond.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Peen \Peen\ (p[=e]n), n. [Cf. G. pinne pane of a hammer.]
   (a) A round-edged, or hemispherical, end to the head of a
       hammer or sledge, used to stretch or bend metal by
       indentation.
   (b) The sharp-edged end of the head of a mason's hammer.
       [Spelt also pane, pein, and piend.]
       [1913 Webster]

WordNet (r) 3.0 (2006):

pane
    n 1: sheet glass cut in shapes for windows or doors [syn:
         pane, pane of glass, window glass]
    2: a panel or section of panels in a wall or door [syn:
       paneling, panelling, pane]
    3: street name for lysergic acid diethylamide [syn: acid,
       back breaker, battery-acid, dose, dot, Elvis,
       loony toons, Lucy in the sky with diamonds, pane,
       superman, window pane, Zen]