American Dictionary of the English Language

EXHALA'TION, noun [Latin exhalatio. See Exhale.]

1. The act or process of exhaling, or sending forth fluids in the form of steam or vapor; evaporation.

2. That which is exhaled; that which is emitted, or which rises in the form of vapor; fume or steam; effluvia. Exhalations are visible or invisible. The earth is often dried by evaporation, without visible exhalations. The smell of fragrant plants is caused by invisible exhalations.