arsenic

Meaning of arsenic: Arsenic is a naturally occurring toxic element, historically used medicinally and as a poison, now also used in a targeted leukemia treatment.

Definition of arsenic

Arsenic is a naturally occurring chemical element found in rock, soil, water, and air, sometimes in forms that are highly toxic to humans. Exposure can occur through contaminated drinking water in certain regions, occupational exposure, or historically, through its use as a pesticide, wood preservative, and even, in earlier eras, as a medicinal remedy for various ailments.

Chronic arsenic exposure is associated with a range of health effects, including skin changes and an increased long term risk of certain cancers, while acute poisoning can affect the digestive system, nervous system, and heart. Because arsenic can be difficult to detect by taste or smell in water, environmental testing is often used to identify contamination.

In modern medicine, arsenic trioxide, a purified pharmaceutical form of arsenic, is used as a targeted treatment for acute promyelocytic leukemia, a specific subtype of acute myeloid leukemia, illustrating how the same element can act as both a toxin and a therapeutic agent depending on the form and dose used.