# trinomial

[trahy-noh-mee-uh l] /traɪˈnoʊ mi əl/
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
3.
Algebra. an expression that is a sum or difference of three terms, as 3 x + 2 y + z or 3 x 3 + 2 x 2 + x.
4.
Biology. a trinomial name, as Rosa gallica pumila.
Origin of trinomial
1665-1675
1665-75; tri- + (bi)nomial
Related forms
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for trinomial
Historical Examples
• A trinomial in algebra is a quantity consisting of three terms.

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

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.

Erwin E. Klaas
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
3.
(maths) a polynomial consisting of three terms, such as ax² + bx + c
4.
(biology) the third word in the trinomial name of an organism, which distinguishes between subspecies
Derived Forms
Word Origin
C18: tri- + -nomial on the model of binomial
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for trinomial

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

Online Etymology Dictionary, © 2010 Douglas Harper
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trinomial in Science
 trinomial   (trī-nō'mē-əl)    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
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### Difficulty index for trinomial

Few English speakers likely know this word

### Word Value for trinomial

0
14
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