Relating to or of the nature of effluvium; characterized by emanations or vaporous discharges.
From 'effluvium' plus '-al' suffix creating an adjective. This form is archaic and appears primarily in older medical, philosophical, and scientific texts.
When 18th-century doctors wrote about 'effluvia diseases' or 'effluvia emanations,' they were trying to sound scientific while actually describing phenomena they couldn't see or measure.
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