Binomial

Webster's Dictionary of the English Language

·adj Consisting of two terms; pertaining to binomials; as, a binomial root.

II. Binomial ·noun An expression consisting of two terms connected by the sign plus (+) or minus (-); as, a + b, or 7 - 3.

III. Binomial ·adj Having two names;

— used of the system by which every animal and plant receives two names, the one indicating the genus, the other the species, to which it belongs.