Definition of water-vascular system
: a system of canals in echinoderms containing a circulating watery fluid that is used for the movement of the tentacles and tube feet
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“Water-vascular system.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/water-vascular%20system. Accessed 21 Oct. 2021.
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The first known use of water-vascular system was in 1851
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