SKIP TO CONTENT

Down syndrome

Definitions of Down syndrome
  1. noun
    a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation
    synonyms: Down's syndrome, mongolianism, mongolism, trisomy 21
    see moresee less
    type of:
    birth defect, congenital abnormality, congenital anomaly, congenital defect, congenital disorder
    a defect that is present at birth
    trisomy
    chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell
Word Family
EDITOR’S CHOICE

Test prep from the experts

Boost your test score with programs developed by Vocabulary.com’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.

SAT/PSAT

$29.95
  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week

TOEFL

$29.95
  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week

ACT

$29.95
  • Number of words: 700+
  • Duration: 10 weeks
  • Time: 1 hour / week