trisomy

English Thesaurus

1. chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell (noun.state)

hypernym	:	chromosomal aberration, chromosomal anomaly, chromosonal disorder, chrosomal abnormality,
definition	:	any change in the normal structure or number of chromosomes; often results in physical or mental abnormalities (noun.state)

hyponym	:	down syndrome, down's syndrome, mongolianism, mongolism, trisomy 21,
definition	:	a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation (noun.state)