trimmer-arch

trimmer arch

noun Building Trades.
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.

Origin:
1825–35

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
trimmer arch

noun
an arch built between trimmers in a floor (to support the weight of a hearth) 
WordNet® 3.0, © 2006 by Princeton University.
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