Obsolete form of theirs.

Eye dialect spelling of there's.

(medicine) A therapeutic agent

Of, or relating to therapy. / Having a positive effect on the body or mind.

(pharmacology) The range of doses of a drug which are effective without being harmful.

In a therapeutic manner.

Someone who studies, works with, or uses therapeutics; a therapist.

(medicine) The treatment of disease; the science of healing; any therapeutic material or treatment

a vaccine which prevents or eases the severity of the problems from an infection that has already occurred.

plural of Therapeut