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1. Consisting of three names or terms, as a taxonomic designation.
2. Mathematics Consisting of three terms.
1. A three-part taxonomic designation indicating genus, species, and subspecies or variety, such as Brassica oleracea botrytis, the cauliflower.
2. Mathematics An algebraic expression consisting of three terms connected by plus or minus signs, such as x2 + 4x -3.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
the trinomial system of naming
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the use of three terms or names in the classification of a species, genus, variety, etc. — trinomial, adj.See also: Classification
the use of three terms or names in the classification of a species, genus, variety, etc. — trinomial, n., adj.See also: Names
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.