Res·er·voir n.
 1. A place where anything is kept in store; especially, a place where water is collected and kept for use when wanted, as to supply a fountain, a canal, or a city by means of aqueducts, or to drive a mill wheel, or the like.
 2. Bot. A small intercellular space, often containing resin, essential oil, or some other secreted matter.
 Receiving reservoir Water Works, a principal reservoir into which an aqueduct or rising main delivers water, and from which a distributing reservoir draws its supply.
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