trisomy

noun tri·so·my \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

tri- + ³-some + ²-y

First Known Use: 1930

Medical Dictionary

noun tri·so·my \ˈtrī-ˌsō-mē\

plural tri·so·mies

: the condition (as in Down syndrome) of having one or a few chromosomes triploid in an otherwise diploid set

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