Loss of the capacity to experience pleasure. The inability to gain pleasure from normally pleasurable experiences. Anhedonia is a core clinical feature of depression, schizophrenia, and some other mental illnesses.
An anhedonic mother finds no joy from playing with her baby. An anhedonic football fan is not excited when his team wins. An anhedonic teenager feels no pleasure from passing the driving test.
“Anhedonia” is derived from the Greek “a-” (without) “hedone” (pleasure, delight). Other words derived from “hedone” include hedonism (a philosophy that emphasizes pleasure as the main aim of life), hedonist (a pleasure-seeker), and hedonophobia (an excessive and persistent fear of pleasure).
Anhidrosis: Lack of sweating. Anhidrosis creates a dangerous inability to tolerate heat.
Anaerobic: Not requiring oxygen. Anaerobic bacteria, for example, do not require oxygen to grow.
ANA: Antinuclear antibody, an unusual antibody directed against structures within the nucleus of the cell. ANAs are found in patients whose immune system is predisposed to cause inflammation against their own body tissues. Antibodies that are directed against one’s own tissues are referred to as autoantibodies. The propensity for the immune system to work against […]
An-: Prefix very much employed in medicine and all of the health sciences, indicating “not, without, or -less.” For example, the prefix “an” figures into these words: anemia (without blood), anophthalmia (no eye), anotia (no ear), anoxia (no oxygen). The “an-” usually becomes “a-” before a consonant as, for example, in alexia (not read), aphagia […]
Anion: A negatively charged ion. Pronounced an-I-on. An anion is as opposed to a cation, which is a positively charged ion.