Down syndrome

//daʊn ˈsɪndɹəʊm// noun

Definitions

Noun
  1. 1
    A genetic disorder caused by the presence of all or part of a third copy of chromosome 21 (a chromosomal excess), whereby the patients typically have a delay in cognitive ability and physical growth, as well as a small head and tilted eyelids. Australia, Canada, Ireland, New-Zealand, US, uncountable, usually
  2. 2
    a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation wordnet

Etymology

Named after John Langdon Haydon Down (1828–1896), an English physician who first described the condition as a distinct form of mental disability in the 1860s.

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