Agenesis of the gallbladder: A condition in which the gallbladder fails to develop. It occurs in 1 in about every 1,000 people, usually without additional birth defects.
- Agenesis, sacral
Agenesis, sacral: Failure of formation of all or part of the sacrum (the lowest section of the spine). Currarino syndrome is a condition characterized by the combination of: Partial absence of the sacrum (the lowest portion of spine), Anorectal (anal and rectal) abnormalities, and An abnormal mass in front of the sacrum (due to a […]
- Agent Orange
Agent Orange: An herbicide and defoliant containing 2,4-D and 2,4,5-T and trace amounts of dioxin. Agent Orange was used as a defoliant in the Vietnam War. Agent Orange is a carcinogen and teratogen (cause cancer and birth defects). The Institute of Medicine of the National Academies in the US has found “sufficient evidence” of an […]
- Agent, anti-infective
Agent, anti-infective: An agent that is capable of acting against infection, either by inhibiting the spread of an infectious agent or by killing the infectious agent outright.
- Agent, antibiotic
Agent, antibiotic: A drug used to treat bacterial infections. The original definition of an antibiotic was a substance produced by one microorganism that selectively inhibits the growth of another microorganism. However, wholly synthetic antibiotics (usually chemically related to natural antibiotics) have since been produced that accomplish comparable tasks. In 1926, Alexander Fleming discovered penicillin, a […]
- Agent, antifungal
Agent, antifungal: A drug used to treat fungal infections. Examples of antifungal drugs include miconazole (MONISTAT) and clotrimazole (LOTRIMIN, MYCELEX).