# trinomial

[ trahy-noh-mee-uhl ]

1. Algebra. consisting of or pertaining to three terms.

2. Biology.

• pertaining to a scientific name comprising three terms, as of genus, species, and subspecies or variety.

• characterized by the use of such names.

noun
1. Algebra. an expression that is a sum or difference of three terms, as 3x + 2y + z or 3x3 + 2x2 + x.

2. Biology. a trinomial name, as Rosa gallica pumila.

## Origin of trinomial

1
First recorded in 1665–75; tri- + (bi)nomial

## Words Nearby trinomial

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

## How to use trinomial in a sentence

• The trinomial is used whenever subspecific identities could be made with a reasonable degree of certainty.

• Duellman used the trinomial for this population and named a new subspecies, pallidus, from Nayarit.

• I have sometimes loosely speculated on what nomenclature would come to, and concluded that it would be trinomial.

• A trinomial in algebra is a quantity consisting of three terms.

Orthography | Elmer W. Cavins

## British Dictionary definitions for trinomial

trinomial

/ (traɪˈnəʊmɪəl) /

1. maths consisting of or relating to three terms

2. biology denoting or relating to the three-part name of an organism that incorporates its genus, species, and subspecies

noun
1. maths a polynomial consisting of three terms, such as ax ² + bx + c

2. biology the third word in the trinomial name of an organism, which distinguishes between subspecies

## Origin of trinomial

1
C18: tri- + -nomial on the model of binomial

## Derived forms of trinomial

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

## Scientific definitions for trinomial

trinomial

[ trī-nōmē-əl ]

1. A mathematical expression that is the sum of three monomials, such as ax2 + bx - c.

2. A taxonomic designation indicating genus, species, and subspecies or variety, as in Brassica oleracea botrytis, the cauliflower.