The quality or state of being fumose; smokiness or the condition of producing fumes (archaic/rare).
From the Latin adjective 'fumosus' plus the Latin noun-forming suffix '-itas' (abstract quality), creating an elevated, learned term for smokiness.
Words like 'fumosity' belong to the rarefied vocabulary of medieval scholars and alchemists—it's the kind of word a 14th-century physician might use to describe a patient's diseased breath.
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