trisomy

noun

tri·​so·​my ˈtrī-ˌsō-mē How to pronounce trisomy (audio)
plural trisomies
: the condition (as in Down syndrome) of having one or a few chromosomes triploid in an otherwise diploid set
trisomic adjective or noun

Examples of trisomy in a Sentence

Recent Examples on the Web
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Rare genetic conditions: These may include Edwards’ syndrome (trisomy 18) or Patau’s syndrome (trisomy 13). Julie Marks, Verywell Health, 1 July 2024 Cox, 20 weeks pregnant when the legal fight began, found out her baby was diagnosed with full trisomy 18 after multiple trips to the emergency room and further testing. Tribune News Service, Hartford Courant, 24 June 2024 Cox's fetus was diagnosed with trisomy 18, a condition described as incompatible with life. Emily Chang, ABC News, 24 June 2024 This is simply a thorough ultrasound (it's often done in combination with the NIPT blood test) that screens for different markers of Down syndrome, trisomy 13, trisomy 18, and other chromosomal abnormalities. Christin Perry, Parents, 6 May 2024 See all Example Sentences for trisomy 

Word History

Etymology

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

First Known Use

1930, in the meaning defined above

Time Traveler
The first known use of trisomy was in 1930

Dictionary Entries Near trisomy

Cite this Entry

“Trisomy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/trisomy. Accessed 22 Nov. 2024.

Medical Definition

trisomy

noun
tri·​so·​my ˈtrī-ˌsō-mē How to pronounce trisomy (audio)
plural trisomies
: the condition (as in Down syndrome) of having one or a few chromosomes triploid in an otherwise diploid set

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