An outlet, channel, duct: chiefly of a lake or reservoir. Also figurative. Obsolete except in Roman History.

An outlet; a vent. Obsolete. rare.

transferred. Any outlet or place of issue; a passage, exit, or way out. Chiefly figurative.

An outlet or opening through which something flows or is discharged. Frequently figurative. Obsolete.

An opening by which to pass; an outlet; spec. (in quot.) a pore or stoma in a plant.

A funnel, vent, or other opening through which matter is emitted or discharged.

= emissary, n.2