from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See Down syndrome.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The presence of three copies of the 21st chromosome in the karyotype.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation
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