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Related to trisomy 21: trisomy 21 syndrome
See Down syndrome.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(or Down's′) syn′drome
a genetic disorder associated with the presence of an extra chromosome 21, characterized by mental retardation, weak muscle tone, and epicanthic folds at the eyelids.Formerly, mongolism. Also called trisomy 21.
[1960–65; after John Latin. H. Down (1828–96), British physician]
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|Noun||1.||trisomy 21 - a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation|
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
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