down's syndrome

2 definitions found

down's syndrome - Collaborative International Dictionary of English v.0.48 :

  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]

down's syndrome - WordNet (r) 2.1 (2005) :

  Down's syndrome
      n 1: 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, trisomy 21]