wa·ter-vas·cu·lar system(wô′tər-văs′kyə-lər, wŏt′ər-)
A system of water-filled canals derived from the coelom that connects the tube feet of echinoderms.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.