The Collaborative International Dictionary of English v.0.48:
Binominal \Bi*nom"i*nal\, a. [See Binomial.] Of or pertaining to two names; binomial. [1913 Webster]WordNet (r) 3.0 (2006):
binominal adj 1: having or characterized by two names, especially those of genus and species in taxonomies; "binomial nomenclature of bacteria" [syn: binomial, binominal]