1550s (n.); 1560s (adj.), from Late Latin binomius "having two personal names," a hybrid from bi- (see bi-) + nomius, from nomen (see name (n.)). Taken up 16c. in the algebraic sense "consisting of two terms."
binomial in Medicine
binomial bi·no·mi·al (bī-nō'mē-əl) adj. Consisting of two terms or names, such as the genus and species names of organisms. n. A taxonomic name used in binomial nomenclature.
binomial in Science
binomial
(bī-nō'mē-əl) A mathematical expression that is the sum of two monomials, such as 3a + 2b.