Down syndrome 
(doun) or Down's syndrome (dounz)
(doun) or Down's syndrome (dounz)n.
A congenital disorder caused by the presence of an extra 21st chromosome and marked usually by moderate to severe intellectual disabilities, short stature, and a flattened facial profile.Also called trisomy 21.
[After John Langdon Haydon Down (1828-1896), British physician.]
- chlorocarbon
- chlorofluorocarbon
- chloroform
- chlorohydrin
- chlorophyll
- chlorophyllous
- chlorophyte
- chloropicrin
- chloroplast
- chloroplastic
- chloroplastid
- chloroprene
- chloroquine
- chlorosis
- chlorothalonil
- chlorothiazide
- chlorotic
- chlorotically
- chlorpromazine
- chlorpropamide
- chlorpyrifos
- chmn.
- choanocyte
- chock
- chock-a-block