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| Abortion | Intentionally causing the death of a fetus in uterus, by either active or passive means. |
| Abuse-Liable | Pharmacological substances that have the potential for creating abusive dependency. Abuse-liable substances can include both illicit drugs (e.g., heroine) and licit drugs (e.g., methamphetamines). |
| Active Abortion | Intentionally-caused death of a fetus in uterus, by direct assault on the body of the fetus itself, rather than the Condition of pregnancy which supports it. |
| Active Euthanasia | Mercy-killing; direct act of physically killing a sick or dying person. |
| Adamha | Alcohol, Drug Abuse, and Mental Health Administration; reorganized in October 1992 as the Substance Abuse and Mental Health Services Administration (SAMHSA). ADAMHA included the National Institute of Mental Health (NIMH), the National Institute on Alcohol Abuse and Alcoholism (NIAAA), the National Institute on Drug Abuse (NIDA), the Office for Substance Abuse Prevention (OSAP), and the Office for Treatment Intervention (OTI). NIMH, NIAAA, and NIDA are now part of the National Institutes of Health (NIH). |
| Adipose tissue | A type of connective tissue that stores fat. |
| Adjuvant therapy | therapy provided to enhance the effect of a primary therapy; auxiliary therapy. |
| Adult stem cell | An undifferentiated cell found in a differentiated tissue that can renew itself and (with certain limitations) differentiate to yield all the specialized cell types of the tissue from which it originated. |
| Adverse Drug Reaction (ADR) | In the pre-approval clinical experience with a new medicinal product or its new usages, particularly as the therapeutic dose(s) may not be established |
| Adverse effect | An undesirable and unintended, although not necessarily unexpected, result of therapy or other intervention (e.g., headache following spinal tap or intestinal bleeding associated with aspirin therapy). |
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