from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Consisting of three names or terms, as a taxonomic designation.
  • adj. Mathematics Consisting of three terms.
  • n. A three-part taxonomic designation indicating genus, species, and subspecies or variety, such as Brassica oleracea botrytis, the cauliflower.
  • n. Mathematics An algebraic expression consisting of three terms connected by plus or minus signs.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Consisting of three names or parts or terms.
  • n. An expression consisting of 3 terms.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Consisting of three terms; of or pertaining to trinomials.
  • adj. Consisting of, or involving the use of, three terms.
  • n. A quantity consisting of three terms, connected by the sign + or -.

from The Century Dictionary and Cyclopedia

  • In zoology and botany:
  • Consisting of three terms, as the technical name of a subspecies; trionymal: thus, the name Certhia familiaris americana is trinomial. See binomial, polynomial.
  • Using or admitting trinomial or trionymal names in certain cases: as, the trinomial system of nomenclature. Also trinominal.
  • In algebra, consisting of three terms connected by either of the signs + and—: thus, a + b + c, or x—2 xy + y is a trinomial quantity.
  • n. A technical name consisting of three words, of which the first is the name of the genus, the second that of the species, and the third that of a geographical race, subspecies, or variety; a trionym.
  • n. In algebra, a trinomial expression. See I., 2.


from The American Heritage® Dictionary of the English Language, 4th Edition

tri- + (bi)nomial.


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