trisomy

Definitions of trisomy
  1. noun
    chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell
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    types:
    Down syndrome, Down's syndrome, mongolianism, mongolism, trisomy 21
    a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation
    type of:
    chromosomal aberration, chromosomal anomaly, chromosonal disorder, chrosomal abnormality
    any change in the normal structure or number of chromosomes; often results in physical or mental abnormalities
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