Noun: trisomy 'trI,sow-mee
- Chromosomal abnormality in which there is one more than the normal number of chromosomes in a cell
"Down syndrome is caused by trisomy of chromosome 21"
Derived forms: trisomies
Type of: chromosomal aberration, chromosomal abnormality, chromosomal anomaly, chromosomal disorder
Encyclopedia: Trisomy