Exhalation (n.) The act or process of exhaling, or sending forth in the form of steam or vapor; evaporation.

Exhalation (n.) That which is exhaled, or which rises in the form of vapor, fume, or steam; effluvium; emanation; as, exhalations from the earth or flowers, decaying matter, etc.

Exhalation (n.) A bright phenomenon; a meteor.