antidotary noun 2adjective 1forms 1 noun2 •(historical) A book of antidotes or pharmacological preparations.In the Antidotaries of the Ancients, we find a great many Physical Compositions which seem to be wholly design’d for the Liver […] — 1685 •(no longer used) An antidote. adjective1 •Relating to or being an antidote, antidotal.It is a gross mistake to suppose that the apothecary’s shop contains a remedy for every disease, or that medical skill consists in prescribing an antidotary drug […] — 1838 formsantidotaries