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trestletree

[tres-uh l-tree]
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noun Nautical.
  1. either of a pair of timbers or metal shapes lying along the tops of the hounds or cheeks of a mast to support crosstrees or a top.
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Origin of trestletree

First recorded in 1615–25; trestle + tree
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for trestletree

trestletree

noun
  1. nautical either of a pair of fore-and-aft timbers fixed horizontally on opposite sides of a lower masthead to support an upper mast
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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