1
- (of an algebraic expression) consisting of three terms（代数）三项式的。
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【生】三名（法）的。
词源
late 17th cent.: from TRI- 'three', on the pattern of binomial.