monoamine oxidase inhibitor: any of a group of antidepressant drugs that inhibit the action of monoamine oxidase in the brain and so allow monoamines to accumulate
antidepressant: any of a class of drugs used to treat depression; often have undesirable side effects
staff sergeant: a noncommissioned officer ranking above corporal and below sergeant first class in the Army or Marines or above airman 1st class in the Air Force