9 letters · 14 points in Scrabble
noun something that restrains a flood or outpouring
noun regulator consisting of a valve or gate that controls the rate of water flow through a sluice
originFrom Middle English flodegate, flodgate, flodeyate, floodȝate, flodȝete, equivalent to flood + gate.
Etymology from Wiktionary, CC BY-SA 3.0