noun
: a lock situated between an enclosed basin or a canal and the tidewater of a harbor or river when they are on different levels so that craft can pass either way at all times of the tide
noun
: a lock situated between an enclosed basin or a canal and the tidewater of a harbor or river when they are on different levels so that craft can pass either way at all times of the tide
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012