- Algebra. consisting of or pertaining to three terms.
- pertaining to a scientific name comprising three terms, as of genus, species, and subspecies or variety.
- characterized by the use of such names.
- Algebra. an expression that is a sum or difference of three terms, as 3x + 2y + z or 3x3 + 2x2 + x.
- Biology. a trinomial name, as Rosa gallica pumila.
Origin of trinomial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for trinomial
A trinomial in algebra is a quantity consisting of three terms.Orthography
Elmer W. Cavins
I have sometimes loosely speculated on what nomenclature would come to, and concluded that it would be trinomial.More Letters of Charles Darwin
Duellman used the trinomial for this population and named a new subspecies, pallidus, from Nayarit.
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
- maths consisting of or relating to three terms
- biology denoting or relating to the three-part name of an organism that incorporates its genus, species, and subspecies
- maths a polynomial consisting of three terms, such as ax ² + bx + c
- biology the third word in the trinomial name of an organism, which distinguishes between subspecies
C18: tri- + -nomial on the model of binomial
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for trinomial
Online Etymology Dictionary, © 2010 Douglas Harper
- A mathematical expression that is the sum of three monomials, such as ax2 + bx - c.
- A taxonomic designation indicating genus, species, and subspecies or variety, as in Brassica oleracea botrytis, the cauliflower.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.