trisomy
noun
- the condition of having three copies of a given chromosome in each somatic cell rather than the normal number of two
Wiktionary
Pronunciation: /ˈtɹʌɪ.sə(ʊ)mi/
noun
Etymology: Etymology tree English trisome English -y English trisomy From trisome + -y.
- The presence of three copies, instead of the normal two, of a particular chromosome of an organism.