trisomy

noun
tri·so·my | \ ˈtrī-ˌsō-mē \
plural trisomies

Definition of trisomy 

: the condition (as in Down syndrome) of having one or a few chromosomes triploid in an otherwise diploid set

Keep scrolling for more

Other words from trisomy

trisomic \(ˌ)trī-ˈsō-mik \ adjective or noun

Examples of trisomy in a Sentence

Recent Examples on the Web

Hallie was born with trisomy 13, a condition in which a person has an extra chromosome 13. Rose Minutaglio, Good Housekeeping, "Inside the School That Teaches You How to Be Santa," 16 Dec. 2017 After an ultrasound and a blood test showed positive markers for trisomy 21, her doctor pushed for amniocentesis, which tests amniotic fluid. Asher Fogle, Good Housekeeping, "Where Have All the Kids with Down Syndrome Gone?," 11 Feb. 2017 The following week, a blood test came back positive for trisomy 21. Asher Fogle, Good Housekeeping, "Where Have All the Kids with Down Syndrome Gone?," 11 Feb. 2017

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

See More

First Known Use of trisomy

1930, in the meaning defined above

History and Etymology for trisomy

tri- + -some entry 3 + -y entry 2

Keep scrolling for more

Learn More about trisomy

Statistics for trisomy

Look-up Popularity

Time Traveler for trisomy

The first known use of trisomy was in 1930

See more words from the same year

Keep scrolling for more

More Definitions for trisomy

trisomy

noun
tri·so·my | \ ˈtrī-ˌsō-mē \
plural trisomies

Medical Definition of trisomy 

: the condition (as in Down syndrome) of having one or a few chromosomes triploid in an otherwise diploid set

More from Merriam-Webster on trisomy

Britannica.com: Encyclopedia article about trisomy

Comments on trisomy

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

WORD OF THE DAY

an open space surrounded by woods

Get Word of the Day daily email!

Test Your Vocabulary

Name that Food Quiz

Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

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

TAKE THE QUIZ

Love words? Need even more definitions?

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