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The Collaborative International Dictionary
Breastsummer

Breastsummer \Breast"sum`mer\, n. (Arch.) A summer or girder extending across a building flush with, and supporting, the upper part of a front or external wall; a long lintel; a girder; -- used principally above shop windows. [Written also brestsummer and bressummer.]

Wiktionary
breastsummer

n. (context architecture English) (alternative spelling of bressummer English)