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breathing valve

noun
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Definition of breathing valve

: one of certain folds of membrane that control the direction of the flow of water through the mouth, past the gills, and to the exterior in many fishes

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“Breathing valve.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/breathing%20valve. Accessed 13 Jun. 2021.

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