The term substance, when discussed in the context of substance abuse and dependence, refers to medications, drugs of abuse, and toxins. These substances have an intoxicating effect, desired by the user, which can have either stimulating (speeding up) or depressive/sedating (slowing down) effects on the body.
Definition of heal. 1  transitive verb. 2  1a : to make free from injury or disease : to make sound or whole heal a woundb : to make well again : to restore to health heal the sick.
healing. 1  balsam - First referred to an aromatic resinous substance with healing or soothing properties. 2  healing, curing - Healing is a process in which an organism's health is restored; curing is a method that promotes healing. 3  psychiatry - From Greek psykhe, mind, and iatreia, healing..