Down syndrome Down" syn`drome, Down's syndrome Down's" syn`drome, n. (Med.) A congenital disorder caused by an extra chromosome 21 in some or all cells. It causes a variable number and degree of abnormalities, including retarded growth, mental retardation, a short nose, prominent epicanthic folds on the eyelids, a protruding lower lip, and other physical features having varying degrees of deviation from the normal. Called also {mongolism}, {trisomy-21} and {trisomy 21 syndrome}. [PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • trisomy 21 — n. See Down syndrome. * * * …   Universalium

  • trisomy 21 — twent ē wən n DOWN SYNDROME …   Medical dictionary

  • trisomy 21 — noun a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation • Syn: ↑mongolism, ↑mongolianism, ↑Down s syndrome, ↑Down syndrome • Hypernyms: ↑trisomy, ↑birth defect, ↑ …   Useful english dictionary

  • trisomy 21 — noun Etymology: from the occurrence of trisomy in chromosome 21 of persons with Down syndrome Date: 1961 Down syndrome …   New Collegiate Dictionary

  • trisomy-21 — noun Medicine the most common form of Down s syndrome, caused by an extra copy of chromosome number 21 …   English new terms dictionary

  • trisomy 21 — /ˌtraɪsəmi twɛntiˈwʌn/ (say .truysuhmee twentee wun) noun the abnormal addition of a chromosome to the pair identified as chromosome 21, resulting in Down syndrome. {named by French geneticist, Jerome Lejeune, 1927–94} …   Australian English dictionary

  • trisomy 21. — See Down syndrome. * * * …   Universalium

  • trisomy 21 — noun The presence of three copies of the 21st chromosome in the karyotype. Syn: Down syndrome …   Wiktionary

  • trisomy 21 — n. pat Down syndrome …   From formal English to slang

  • trisomy 21. — See Down syndrome …   Useful english dictionary

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