trisomy 21

noun

Examples of trisomy 21 in a Sentence

Recent Examples on the Web
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The clinical name for Down syndrome is trisomy 21, a genetic condition in which a person is born with an extra chromosome, causing mild to moderate cognitive disability, developmental delays and physical challenges. Stephen Hawkins, Chicago Tribune, 18 Jan. 2025 The causes behind Down syndrome are not entirely clear, but scientists have noted, among other things, a common link between older maternal age and trisomy 21. Krissi Danielsson, Parents, 30 July 2024 The most common type of Down syndrome is trisomy 21, which accounts for 95% of all cases. Angelica Stabile, Fox News, 7 Oct. 2024 For example, babies with trisomy 21 have Down syndrome. Krissi Danielsson, Parents, 30 July 2024 See all Example Sentences for trisomy 21 

Word History

Etymology

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

First Known Use

1961, in the meaning defined above

Time Traveler
The first known use of trisomy 21 was in 1961

Dictionary Entries Near trisomy 21

Cite this Entry

“Trisomy 21.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/trisomy%2021. Accessed 8 Feb. 2025.

Medical Definition

More from Merriam-Webster on trisomy 21

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