A medicine or other agent that gives protection from disease or infection. Obsolete.

A means of preserving; a preservative, spec. a medicine or other agent that gives protection from disease or infection. Now rare.

A medicine or course of action taken to prevent or as a precaution against disease, etc. Hence more widely: a protective measure, a precaution.

A thing which preserves; a preservative. Obsolete.

A means of preserving or protecting; a substance or object that gives protection from disease or deterioration; a preservative. Now rare.

Medicine. A drug, foodstuff, procedure, etc., used to protect against or prevent disease. With against, of; also (rare) for.

Medicine. = preventive, n. 2. With against, for, of.

A medicinal substance or remedy that protects from disease, toxicity, or infection.

A modification or transformation product of a toxin, in which the toxophoric group of atoms is lost, and which has therefore no toxic effect, but…