Search:water tube -> WATER TUBE
water tube
w a t e r t u b e hex:#119;#97;#116;#101;#114;#32;#116;#117;#98;#101;
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- Water tube - - 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.