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1. Architecture A narrow, flat molding.
2. Printing A flat piece of wood used to separate lines of type.
1. (Architecture) a flat narrow architectural moulding
2. (Printing, Lithography & Bookbinding) printing a strip of oiled wood used for spacing between lines of hot metal type. Compare lead27
[C16: from Old French, literally: a little rule, from regle rule, from Latin rēgula]