Definition of polysomic in English:

polysomic

Pronunciation /ˌpɒlɪˈsəʊmɪk/

adjective

Genetics
  • Having one or more normal chromosomes in addition to the usual diploid or polyploid complement; involving or designating such a chromosome.

noun

Genetics
  • A polysomic organism or chromosome.

Origin

1930s; earliest use found in Journal of Genetics. From poly- + -somic, after monosomic, polysomy.