Usually Offensive. a developmental disorder characterized in varying degrees by a subnormal ability to learn, a substantially low IQ, and impaired social adjustment.
(psychiatry) the condition of having a low intelligence quotient (below 70)
mental retardation n.
Subnormal intellectual development or functioning that is the result of congenital causes, brain injury, or disease and is characterized by any of various deficiencies, ranging from impaired learning ability to social and vocational inadequacy. Also called mental deficiency.
Below-average intellectual ability resulting from a genetic defect, brain injury, or disease, and usually present from birth or early infancy.
- Mental scotoma
mental scotoma n. See blind spot.
- Mental spine
mental spine n. A slight projection located in the middle line of the rear surface of the body of the lower jawbone that gives attachment below to the geniohyoid muscle and above to the genioglossus muscle. Also called genial tubercle.
- Mental symphysis
mental symphysis n. The fibrocartilaginous union of the two halves of an infant’s lower jawbone that ossifies during the first year.
noun 1. .