Interpenetrating molding

(Arch.) in late Gothic architecture, a decoration by means of moldings which seem to pass through solid uprights, transoms, or other members; often, two sets of architectural members penetrating one another, in appearance, as if both had been plastic when they were put together.

See also: Interpenetrate

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.