dosseret

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dosseret.
1. Supplementary cubical block or super-abacus, often taller than the capital itself, placed over an abacus of Early Christian, Byzantine, and Romanesque capitals, really an impost-block from which arches spring.

2. Block formed like a section of entablature over a column or pier.

3. Small projection on a jamb, forming a pilaster-like member supporting e.g. a lintel.