polysomic
/ˌpɒlɪˈsəʊmɪk/Genetics
adjective
Having one or more normal chromosomes in addition to the usual diploid or polyploid complement; involving or designating such a chromosome.
noun
A polysomic organism or chromosome.
Origin
1930s; earliest use found in Journal of Genetics. From poly- + -somic, after monosomic, polysomy.