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The Collaborative International Dictionary
Water gate

Water gate \Wa"ter gate`\ A gate, or valve, by which a flow of water is permitted, prevented, or regulated.

Wiktionary
water gate

n. A gate, or valve, by which a flow of water is permitted, prevented, or regulated.

WordNet
water gate

n. regulator consisting of a valve or gate that controls the rate of water flow through a sluice [syn: sluicegate, sluice valve, floodgate, penstock, head gate]