1. (n.) The mouth of a river where the tide meets the current; an arm of the sea\.

2. (n.) A place where water boils up; a spring that wells forth.

3. (a.) Belonging to, or formed in, an estuary; as, estuary strata.

arm armlet avenue bay bayou belt bight blowhole boca channel chute cove creek debouch door egress emunctory escape euripus exhaust exit fjord floodgate flume frith gulf gut harbor inlet kyle loch loophole mouth narrow narrow seas narrows natural harbor opening out outcome outfall outgate outgo outlet pore port reach road roads roadstead sally port sluice sound spiracle spout strait straits tap vent ventage venthole vomitory way out weir