There are 2 definitions of trisomy in English:

trisomy

Syllabification: tri·so·my
Pronunciation: /trīˈsōmē, ˈtrīsō-
 
/

noun

Medicine
  • A condition in which an extra copy of a chromosome is present in the cell nuclei, causing developmental abnormalities.
    More 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.

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Word of the day astrogation
Pronunciation: ˌastrəˈgāSHən
noun
(in science fiction) navigation in outer space

There are 2 definitions of trisomy in English:

trisomy-21

Syllabification: tri·so·my-21

noun

Medicine
  • The most common form of Down syndrome, caused by an extra copy of chromosome number 21.
    More 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.

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Definition of trisomy-21 in:

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Word of the day astrogation
Pronunciation: ˌastrəˈgāSHən
noun
(in science fiction) navigation in outer space