definitions
• synonyms

# trinomial

[trahy-noh-mee-uh l]
See more synonyms on Thesaurus.com
1. Algebra. consisting of or pertaining to three terms.
2. Biology.
1. pertaining to a scientific name comprising three terms, as of genus, species, and subspecies or variety.
2. 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 .css-1fxfie5{font-size:22px;}@media (max-width:768px){.css-1fxfie5{font-size:18px;margin:0 10px 10px 0;word-break:break-all;word-wrap:break-word;-webkit-hyphens:auto;-moz-hyphens:auto;-ms-hyphens:auto;hyphens:auto;line-height:22px;}}trinomial

First recorded in 1665–75; tri- + (bi)nomial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for trinomial

### Historical Examples

• #### 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.

British Dictionary definitions for trinomial

# trinomial

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

## Word Origin

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 fortrinomial

1670s, from tri- + second element from binomial.