Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Down syndrome.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Down syndrome

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From Mongolian, term used in a system of classification for mentally retarded people devised by British physician John Langdon Haydon Down (1828–1896) in which different types of mental retardation were associated with non-Caucasian racial categories (the epicanthic folds typical of persons with Down syndrome leading him to associate them with Central and East Asian populations).]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Mongol +‎ -ism, coined by John Langdon Down

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