the narrow edge of a hammer head. see peen.-a division; a distinct piece, limited part, or compartment of any surface; a patch; hence, a square of a checkered or plaided pattern.-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.-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.-especially, in modern use, the glass in one compartment of a window sash.-in irrigating, a subdivision of an irrigated surface between a feeder and an outlet drain.-one of the flat surfaces, or facets, of any object having several sides.-one of the eight facets surrounding the table of a brilliant cut diamond.