Definition of hyperdiploid in English:

hyperdiploid

Pronunciation /ˌhʌɪpəˈdɪplɔɪd/

adjective

Genetics
  • Having one or a few extra chromosomes (originally also chromosome fragments) in addition to the usual diploid set; containing such cells; also as noun, a hyperdiploid cell or individual.

Origin

1920s; earliest use found in Journal of Heredity. From German hyperdiploide.