Definitions

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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