trisomy 21 syndrome
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 syndrome — A common chromosome disorder, often called Down syndrome, due to an extra chromosome number 21 (trisomy 21). The chromosome abnormality affects both the physical and intellectual development of the individual. Trisome 21 (Down) syndrome is… …   Medical dictionary

  • trisomy-21 — 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… …   The Collaborative International Dictionary of English

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

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

  • Syndrome, trisomy 21 — A common chromosome disorder, often called Down syndrome, due to an extra chromosome number 21 (trisomy 21). The chromosome abnormality affects both the physical and intellectual development of the individual. Trisome 21 (Down) syndrome is… …   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

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