There are 2 main definitions of trisomy in English:

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trisomy 1

Line breaks: tri|somy
Pronunciation: /ˈtrɪsəmi/

noun

Medicine
A condition in which an extra copy of a chromosome is present in the cell nuclei, causing developmental abnormalities.
Example sentences
  • The aneuploid embryos detected in the progeny from this cross include trisomies and UPDs of chromosomes 7 and 18.
  • Both monosomy and trisomy of specific chromosomes are associated with developmental defects and cancer risk.
  • A common type of chromosomal abnormality is called a trisomy.

Origin

1930s: from tri- 'three' + -some3.

Definition of trisomy in:

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There are 2 main definitions of trisomy in English:

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trisomy-21 2 Line breaks: trisomy-21

noun

[mass noun] Medicine
The most common form of Down’s syndrome, caused by an extra copy of chromosome number 21.
Example sentences
  • Microcephaly can also be caused by the chromosomal disorder, trisomy-21 Down syndrome, and by environmental factors, such as fetal alcohol syndrome and fetal exposure to radiation before 15 weeks gestation.
  • Trisomy 21 can be detected in the first few months of pregnancy by amniocentesis.
  • The majority (about 94%) of children with Down Syndrome are born with standard Trisomy 21, which is not hereditary.

Definition of trisomy in:

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