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ation perceived by the sense of smell; especially, noisome or noxious exhalation; as, the effluvium from diseased or putrefying bodies, or from ill drainage.

Any subtile, invisible emanation, effluvium, or exhalation from a substance, as the aroma of flowers, the odor of the blood, a supposed fertilizing emanation from the pollen of flowers, etc.

Capable of being given off as an effluvium. "Effluviable matter." Boyle.

To give forth effluvium. [R.] "An effluviating power." Boyle.

That which flows out; effluvium; emanation. Some light effluxions from spirit to spirit. Bacon.

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.

some persons are subject in the spring and summer seasons. It has been attributed to the effluvium from hay, and to the pollen of certain plants. It is also called hay asthma, hay cold, and rose fever. -- Hay knife, a sharp instrument used in cutting hay out of a stack or mow. -- Hay press, a press for baling loose…

To taint with morbid matter or any pestilential or noxious substance or effluvium by which disease is produced; as, to infect a lancet; to infect an apartment.

That which infects, or causes the communicated disease; any effluvium, miasm, or pestilential matter by which an infectious disease is caused. And that which was still worse, they that did thus break out spread the infection further by their wandering about with the distemper upon them. De Foe.