break-in
In bricklaying, a cutout in a brick wall, to form an aperture for the insertion of a timber.
Glossary
breaker ball, headache ball
A heavy, rounded metal weight which is swung from a crane line; used to demolish masonry or concrete structures.
Glossary
breakdown voltage
The voltage at which an electrical insulation ruptures, thereby destroying its insulating value and permitting current flow.
Glossary
breakaway wall
A wall that is not part of the structural support of a building to which it is attached; deliberately intended
Glossary
bread room
In medieval times, a room fitted with shelves for loaves of bread and biscuits, and bins for flour and confectionery;