trisomy 21

noun

Examples of trisomy 21 in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
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 This individual, thought to be the oldest record of Down syndrome, was also examined in the new study and confirmed to have had trisomy 21. Catherine Duncan, Smithsonian Magazine, 27 Feb. 2024 For example, trisomy 21, the most common form, also known as Down syndrome, occurs when a baby is born with three No. 21 chromosomes. Rick Mauch, Fort Worth Star-Telegram, 24 Jan. 2024 The most common type of Down syndrome is trisomy 21. Ashlyn Messier, Fox News, 8 Oct. 2023 Kayleigh Williamson will be wearing bib number 321 at #Boston127—a number representing the trisomy 21 in the Down syndrome community. Shannon Larson, BostonGlobe.com, 14 Apr. 2023

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 24 Jan. 2025.

Medical Definition

More from Merriam-Webster on trisomy 21

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!