ˌräbə(r)tˈsōnēən adjective
Usage: usually capitalized
Etymology: William R.B. Robertson died 1941 American biologist + English -ian
: relating to or being a reciprocal translocation that takes place between two acrocentric chromosomes and that yields one nonfunctional chromosome having two short arms and one functional chromosome having two long arms of which one arm is derived from each parent chromosome