[ trʌɪ'nəʊmɪəl ]
■ adjective
1》 (of an algebraic expression) consisting of three terms.
2》 Biology (of a taxonomic name) consisting of three terms where the first is the name of the genus, the second that of the species, and the third that of the subspecies or variety.
■ noun a ~ expression or taxonomic name.
Origin
C17: from tri- , on the pattern of binomial .