Robertsonian UK /ˌɹɒbətˈsəʊ.ni.ən/US /ˌɹɑbɚtˈsoʊ.ni.ən/ adjective2 •Of or relating to William Rees Brebner Robertson (1881–1941), American zoologist and early cytogeneticist who first discovered the Robertsonian translocation. •Of or relating to Sir Dennis Holme Robertson (1890–1963), English economist. formsmore Robertsonian · most Robertsonian