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What do a.m. and p.m. stand for?

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.
Origin of trimmer arch
1825-1835
1825-35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Value for trimmer

11
13
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