- pertaining to a scientific name comprising three terms, as of genus, species, and subspecies or variety.
- characterized by the use of such names.
Examples from the Web for trinomial
Duellman used the trinomial for this population and named a new subspecies, pallidus, from Nayarit.
A trinomial in algebra is a quantity consisting of three terms.Orthography|Elmer W. Cavins
The trinomial is used whenever subspecific identities could be made with a reasonable degree of certainty.Summer Birds From the Yucatan Peninsula|Erwin E. Klaas
I have sometimes loosely speculated on what nomenclature would come to, and concluded that it would be trinomial.More Letters of Charles Darwin|Charles Darwin