trimmer arch

noun

, Building Trades.

1. an arch, usually of brick and in the form of half of a segmental arch, between a chimney and a header in a floor structure to support a hearth.

Word History and Origins

Origin of trimmer arch¹

First recorded in 1825–35

Example Sentences

The hearth should rest on what is called a trimmer arch, which is made of brick.

From Project Gutenberg