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hammerbeam

or ham·mer beam

[ham-er-beem]
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noun Architecture.
  1. a short wooden beam projecting from an interior wall to support or tie together rafters or arched roof braces.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for hammer beam

hammer beam

noun
  1. either of a pair of short horizontal beams that project from opposite walls to support arched braces and struts
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012