n. [ L. exhalatio: cf. F. exhalaison, exhalation. ] 1. The act or process of exhaling, or sending forth in the form of steam or vapor; evaporation. [ 1913 Webster ]

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. [ 1913 Webster ]

Ye mists and exhalations, that now rise
From hill or steaming lake. Milton. [ 1913 Webster ]

3. A bright phenomenon; a meteor. [ archaic ] [ 1913 Webster +PJC ]

I shall fall
Like a bright exhalation in the evening. Shak. [ 1913 Webster ]