You know what it looks like… but what is it called?
TAKE THE QUIZwater tube
noun
: a tube for passing or holding water: such as
a
: a tube in some steam boilers in which water circulates and steam is generated
b
: a tube of a system of tubular excretory organs in many invertebrates that have external openings and that are held to be analogous in function to the kidneys of vertebrates
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Merriam-Webster unabridged
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