1. A fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt; SYN. volcano, crater.
2. An opening for the escape of gas or air; SYN. venthole, blowhole.
3. External opening of urinary or genital system of a lower vertebrate.

ETYM Cf. French venter to blow, vent wind (see Ventilate); but prob influenced by Eng. vent an opening.
1. To expose to cool or cold air so as to cool or freshen; SYN. ventilate, air out, air.
2. To give expression or utterance to; SYN. ventilate, give vent.