water vascular system
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water vascular system
[′wȯd·ər ′vas·kyə·lər ‚sis·təm] (invertebrate zoology)
An internal closed system of reservoirs and ducts containing a watery fluid, found only in echinoderms.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.