breastsummer

[ bres-suhm-er, brest-, bres-uh-mer ]
/ ˈbrɛsˌsʌm ər, ˈbrɛst-, ˈbrɛs ə mər /

noun Architecture.

a horizontal beam supporting an exterior wall over an opening, as a shop window.

Origin of breastsummer

First recorded in 1605–15; breast + summer2
Also called breast beam.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019