trisomy
tri·so·my
noun \ˈtrī-ˌsō-mē\ plural tri·so·mies
Definition of TRISOMY
: the condition (as in Down syndrome) of having one or a few chromosomes triploid in an otherwise diploid set
— tri·so·mic \(ˌ)trī-ˈsō-mik\ adjective or noun
Origin of TRISOMY
tri- + 3-some + 2-y
First Known Use: 1930
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