trisomy 21 syndrome

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.

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  • 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 13 syndrome — Condition with three rather than the normal two chromosomes #13. Children born with this syndrome have multiple malformations and mental retardation due to the extra chromosome #13. The congenital malformations (birth defects) commonly include… …   Medical dictionary

  • Trisomy 18 syndrome — There are three instead of the normal two chromosomes #18. Children with this condition have multiple malformations and mental retardation due to the extra chromosome #18. The children characteristically have low birth weight, small head… …   Medical dictionary

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  • trisomy 22 syndrome — a rare syndrome due to an extra chromosome 22, characterized typically by mental and growth retardation, microcephaly, low set or malformed ears, micrognathia, long philtrum, preauricular skin tag or sinus, and congenital heart disease. In males …   Medical dictionary

  • Patau syndrome (trisomy 13 syndrome) — A syndrome characterized by multiple malformations, commonly including scalp defects, hemangiomas (blood vessel malformations) of the face and nape of the neck, cleft lip and palate, malformations of the heart and abdominal organs, and flexed… …   Medical dictionary

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