Relating to, used for, or involving fumigation; having the properties or purpose of producing smoke or gas for disinfection.
Derived from 'fumigation' with the Latin adjectival suffix '-ory' (relating to or characterized by), following the pattern of words like 'regulatory' and 'olfactory.'
The word 'fumigatory' was especially common in medical texts of the 1700s-1800s when doctors believed smoke could literally drive away the invisible 'miasmas' that caused disease—wrong theory, right instinct.
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