trisomy 21

tri·​so·​my 21 | \ˈtrī-ˌsō-mē-ˌtwen-tē-ˈwən \

Definition of trisomy 21 

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

Keep scrolling for more

Learn More about trisomy 21

Share trisomy 21

Statistics for trisomy 21

Look-up Popularity

Time Traveler for trisomy 21

The first known use of trisomy 21 was in 1961

See more words from the same year

Keep scrolling for more

More Definitions for trisomy 21

trisomy 21

\-ˌtwent-ē-ˈwən \

Medical Definition of trisomy 21 

More from Merriam-Webster on trisomy 21 Encyclopedia article about trisomy 21

Comments on trisomy 21

What made you want to look up trisomy 21? Please tell us where you read or heard it (including the quote, if possible).


amusing and light sparring with words

Get Word of the Day daily email!

Test Your Vocabulary

Late Autumn 2018 Words of the Day Quiz

  • frosted-autumn-leaves
  • Which is a synonym of yahoo?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!


Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

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