Down's syndrome

World English Dictionary
Down's syndrome or (US) Down syndrome
a.  pathol Former name: mongolism, Technical name: trisomy 21 a condition caused by the presence of an extra copy of chromosome 21 resulting in learning difficulties and physical differences, such as shorter stature
 b.  (as modifier): a Down's syndrome baby
Down syndrome or (US) Down syndrome

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

Down's Syndrome
1961, from J.L.H. Down (1828-1896), English physician; chosen as a less racist name for the condition than earlier mongolism.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
Down syndrome (doun) or Down's Syndrome   (doun)  Pronunciation Key 
A congenital disorder caused by the presence of an extra 21st chromosome. People with down syndrome have mild to moderate mental retardation, short stature, and a flattened facial profile. The syndrome is named after its discoverer, British physician John Langdon Haydon Down (1828-1896).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

Down's syndrome definition

A congenital condition, caused by an abnormality in the chromosomes, marked by moderate to severe mental retardation and changes in certain physical features.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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