Definition of Robertsonian in US English:

Robertsonian

adjective

Genetics
  • Involving or relating to the formation of a metacentric chromosome from two heterologous acrocentric chromosomes by the fusion of their centromeres with the loss of the short arm of each parent chromosome.

Origin

1940s; earliest use found in Evolution. From the name of William R. B. Robertson, U.S. biologist, who first described such translocations in 1916 ( Jrnl. Morphol 27 220) + -ian, after French robertsonien.

Pronunciation

Robertsonian

/ˌrɒbətˈsəʊnɪən/