trimmer arch

American  

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.

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Etymology

Origin of trimmer arch

First recorded in 1825–35

Example Sentences

The hearth, which may be of brick, stone, tile, or concrete, must be supported by a masonry trimmer arch or similar fire-resisting construction.

From Project Gutenberg

He has to form fireplaces, flues, chimneys, and the flat trimmer arches which support the hearth, and has to set the stove, kitchen range, copper, etc., in a proper manner.

From Project Gutenberg