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trisomy 21

noun
tri·​so·​my 21 | \ ˈtrī-ˌsō-mē-ˌtwen-tē-ˈwən How to pronounce trisomy 21 (audio) \

Definition of trisomy 21

: down syndrome

Examples of trisomy 21 in a Sentence

Recent Examples on the Web

 The following week, the results came back positive for trisomy 21, the most common type of Down Syndrome. — Kate Branch, Vogue, "I Have a Newborn with Down Syndrome—Here's What the Gerber Baby News Means to Me," 9 Feb. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'trisomy 21.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of trisomy 21

1961, in the meaning defined above

History and Etymology for trisomy 21

from the occurrence of trisomy in chromosome 21 of persons with Down syndrome

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More Definitions for trisomy 21

trisomy 21

noun
\ -ˌtwent-ē-ˈwən How to pronounce trisomy 21 (audio) \

Medical Definition of trisomy 21

: down syndrome

More from Merriam-Webster on trisomy 21

Britannica.com: Encyclopedia article about trisomy 21

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