trisomy

Noun
  1. Chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell (synset 114528160)
    is a 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
    subtypes: 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

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