bolection

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bo·lec·tion

B0373600 (bō-lĕk′shən)n. Architecture A raised molding covering the joint between two surfaces, as in wood paneling.
[Origin unknown.]

bolection

(bəʊˈlɛkʃən) n (Architecture) architect a stepped moulding covering and projecting beyond the joint between two members having surfaces at different levels. Also called: bilection [C18: of unknown origin]