Bigeneric Definition

bījə-nĕrĭk
adjective
Relating to a hybrid that results from a cross between plants of different genera.
American Heritage
Designating or of hybrids derived from two different genera.
Webster's New World

(botany) Describing an (infertile) cross between plants belonging to different genera.

Wiktionary

(taxonomy) Describing a taxonomic group containing only two genera.

Wiktionary

Origin of Bigeneric