Webster's Revised Unabridged Dictionary · 1913

Exhalation

Exhalation , noun

[Latin exhalatio: compare French exhalaison, exhalation.]

1.
The act or process of exhaling, or sending forth in the form of steam or vapor; evaporation.
2.
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.
Ye mists and exhalations, that now rise From hill or steaming lake. — Milton
3.
A bright phenomenon; a meteor. [archaic]
I shall fall Like a bright exhalation in the evening. — Shakespeare