trisomy

noun
tri·​so·​my | \ ˈtrī-ˌsō-mē How to pronounce trisomy (audio) \
plural trisomies

Definition of trisomy

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

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Other Words from trisomy

trisomic \ (ˌ)trī-​ˈsō-​mik How to pronounce trisomic (audio) \ adjective or noun

Examples of trisomy in a Sentence

Recent Examples on the Web

Most infants born with trisomy 13 die within the first few weeks. Sarah Watts, Glamour, "Your Ob-Gyn Might Not Perform Your Abortion—Here's Why," 5 June 2019 But our baby girl had developed with a genetic anomaly known as mosaic trisomy 14. Nadine Jolie Courtney, SELF, "Everything I Thought I Knew About Miscarriages Changed When I Had Two ‘Silent’ Ones," 22 Apr. 2019 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.

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First Known Use of trisomy

1930, in the meaning defined above

History and Etymology for trisomy

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

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Statistics for trisomy

Last Updated

26 Jul 2019

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Time Traveler for trisomy

The first known use of trisomy was in 1930

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More Definitions for trisomy

trisomy

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

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