English Explanatory Dictionary

Down syndrome

English dictionary entry

Meanings

noun
  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.

Pronunciation

/daʊn ˈsɪndɹəʊm/ /daʊn ˈsɪndɹoʊm/ /-dɹəm/ en-au-Down syndrome.ogg

Word forms

Down syndrome Down’s syndrome

Etymology

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

Synonyms

Down's mongolism Mongolian idiocy trisomy 21

Derived words

Down syndrome regression disorder
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