trisomy 21

1 definition found

trisomy 21 - WordNet (r) 2.1 (2005) :

  trisomy 21
      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]