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noun
Chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell.
is a specific kind of: chromosomal aberration, chromosomal anomaly, chromosonal disorder, chrosomal abnormality.
is a broader term that covers: Down's syndrome, Down syndrome, mongolianism, mongolism, trisomy 21.
Polish: trisomia
Find more on trisomy elsewhere: etymology - rhymes - Wikipedia.
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