picture railn.Interior Decorating a horizontal wooden fitting or plaster moulding running parallel to the ceiling of a room, from which pictures are hung.
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1887 Indiana (Pa.) Weekly Messenger 13 Apr. 4/4 Its neutral color being relieved by a band of maroon ‘flock’ paper and gilt picture rail.
1992 Pract. Householder Nov. 25/2 It was also fashionable to break up the smooth wall surface with a picture rail one foot or so below the cornice.