trisomy
noun
tri·so·my
ˈtrī-ˌsō-mē 
plural trisomies
: the condition (as in Down syndrome) of having one or a few chromosomes triploid in an otherwise diploid set
Examples of trisomy in a Sentence
Recent Examples on the Web
That’s partly because, unlike a condition with a clear genetic marker like Down Syndrome or trisomy 18, ASD encompasses a wide range of conditions that share some characteristics.
—
Laura Tillman, Hartford Courant, 16 June 2025
At a 14-week ultrasound, doctors saw an indicator of a genetic trisomy.
—Wendy Grossman Kantor, People.com, 10 June 2025
Mark your calendar March is health awareness month for bleeding disorders, multiple sclerosis, colorectal cancer, endometriosis, trisomy, traumatic brain injury and kidneys (March 1-15 for the one on the left and March 16-31 for the one on the right).
—Scott Lafee, San Diego Union-Tribune, 4 Mar. 2025
For example, more than half of infants with trisomy 18, a chromosomal abnormality that causes severe heart defects or breathing problems, die within the first week of life.
—Almut Winterstein, The Conversation, 30 Jan. 2025
See All Example Sentences for trisomy
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.
Laura Tillman, Hartford Courant, 16 June 2025
At a 14-week ultrasound, doctors saw an indicator of a genetic trisomy.
—Wendy Grossman Kantor, People.com, 10 June 2025
Mark your calendar March is health awareness month for bleeding disorders, multiple sclerosis, colorectal cancer, endometriosis, trisomy, traumatic brain injury and kidneys (March 1-15 for the one on the left and March 16-31 for the one on the right).
—Scott Lafee, San Diego Union-Tribune, 4 Mar. 2025
For example, more than half of infants with trisomy 18, a chromosomal abnormality that causes severe heart defects or breathing problems, die within the first week of life.
—Almut Winterstein, The Conversation, 30 Jan. 2025
See All Example Sentences for trisomy
Cite this Entry
“Trisomy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/trisomy. Accessed 30 Jun. 2025.
Copy CitationMedical Definition
trisomy
noun
tri·so·my
ˈtrī-ˌsō-mē
plural trisomies
: the condition (as in Down syndrome) of having one or a few chromosomes triploid in an otherwise diploid set
Love words? Need even more definitions?
Merriam-Webster unabridged
Share