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windsail

noun
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Definition of windsail

1 : the sail of a windmill
2 : a wide tube or funnel of canvas used to carry air for ventilation into the lower compartments of a ship

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“Windsail.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/windsail. Accessed 23 Jan. 2021.

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