Acting as a protection or remedy against pestilence; having the quality of preventing or combating plague and epidemic disease.
Extended adjectival form from 'antipestilence,' with the suffix '-ial,' used formally in medical and religious texts to describe disease-prevention measures or divine protection.
In medieval times, people carried 'antipestilential' prayer cards and charms as if they were medieval health insurance—spiritually comforting but biologically helpless against the actual plague.
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