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.
Wound Healing (Definition) Wound healing is a field of study in which a person looks at factors that helps wounds heal and factors that are harmful to wounds trying to heal, in order to find the best treatment for each wound. Wounds can be from infections, surgeries, accidents, etc...