noun Nautical.
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.

1615–25; trestle + tree Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trestletree (ˈtrɛsəlˌtriː)
nautical either of a pair of fore-and-aft timbers fixed horizontally on opposite sides of a lower masthead to support an upper mast

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The trestletree attached the mainmast to the topmast of schooners.
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