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trough keel

noun
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Definition of trough keel

: a keel in a yacht having the form of a trough into which molten lead is poured as ballast — compare bar keel

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“Trough keel.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/trough%20keel. Accessed 10 December 2019.

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