Definition of trisomy in English:

trisomy

noun

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

    • ‘A common type of chromosomal abnormality is called a trisomy.’
    • ‘Both monosomy and trisomy of specific chromosomes are associated with developmental defects and cancer risk.’
    • ‘The aneuploid embryos detected in the progeny from this cross include trisomies and UPDs of chromosomes 7 and 18.’
    • ‘If the proband has trisomy 21, the likelihood of a trisomy 21 pregnancy is minimally increased for family members other than the parents.’
    • ‘First-trimester screening also can help detect other chromosomal abnormalities such as trisomy 18.’

Origin

1930s: from tri- ‘three’+ -some.

Pronunciation:

trisomy

/ˈtrɪsəmi/