Harrison

4. disorder a mental disorder that includes a range of linked conditions, sometimes also extending to include singular symptoms and traits.
6. a severe mental disorder in which thought and emotions are so impaired that contact is lost with external reality.
7. (chiefly of a drug) reducing functional or nervous activity.
9. a person concerned with the theoretical aspects of a subject; a theoretician.
10. the fact or condition of being addicted to a particular substance, thing, or activity.

1. a drug that causes hallucinations, such as LSD.
2. medical care given to a patient for an illness or injury.
3. a synthetic, addictive, mood-altering drug, used illegally as a stimulant and legally as a prescription drug to treat children with ADD and adults with narcolepsy.
5. a long-term mental disorder of a type involving a breakdown in the relation between thought, emotion, and behavior, leading to faulty perception, inappropriate actions and feelings, withdrawal from reality and personal relationships into fantasy and delusion, and a sense of mental fragmentation.
8. an intoxicating, stimulating, or narcotic chemical or drug, especially an illegal one.