Water tube

Water tube

Water tube\ Any tube for passing or holding water; specif., in some steam boilers, a tube in which water circulates and steam is generated.
Webster's Revised

Water tube

Wa"ter tube`\ (Zo["o]l.) One of a system of tubular excretory organs having external openings, found in many invertebrates. They are believed to be analogous in function to the kidneys of vertebrates. See Illust. under Trematodea, and Sporocyst.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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