Water vascular system Meaning, Definition & Usage
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noun system of fluid-filled tubes used by echinoderms in locomotion and feeding and respiration
WordNet
Definitions
(Zoöl.) , a system of vessels in annelids, nemerteans, and many other invertebrates, containing a circulating fluid analogous to blood, but not of the same composition. In annelids the fluid which they contain is usually red, but in some it is green, in others yellow, or whitish.