n. [ A corruption of munnion, F. moignon stump of an amputated limb, stump, OF. moing mutilated; cf. Armor. moñ, mouñ, mank, monk, and also L. mancus maimed. ] (Arch.) (a) A slender bar or pier which forms the division between the lights of windows, screens, etc. (b) An upright member of a framing. See Stile. [ 1913 Webster ]