A collection of antidotes or formulas for treating poisons and diseases; a reference book of remedies.
From antidote + -ary (noun suffix meaning 'collection' or 'place'). Related to words like 'apothecary' which also listed medicinal formulas.
Medieval antidotaries were like ancient poison-control handbooks—some listed hundreds of recipes to survive assassination attempts, which were disturbingly common in royal courts.
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