Definition of breastsummer in English:

breastsummer

Line breaks: breast|sum¦mer
Pronunciation: /ˈbrɛs(t)sʌmə/

Entry from British & World English dictionary

noun

Architecture
  • A beam across a broad opening, sustaining a superstructure.

Origin

early 17th century: from breast and summer2.

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Word of the day milord
Pronunciation: məˈlôrd
noun
used to address an English nobleman