Definition from Wiktionary, the free dictionary
Named after John L.H. Langdon-Down (1828-1896), an English physician who described it in the late 1800s. The term was first used in 1961.
- (chiefly US) Condition caused by a chromosomal excess, whereby the patients bear a certain resemblance to the Mongoloid race, such as a small head and tilted eyelids, and typically have a delay in cognitive ability and physical growth.
Known only as Down's syndrome in the UK.
condition caused by chromosomal deficiency