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Having more than two sets of chromosomes all derived from the same species.
An organism having more than two sets of chromosomes, all of which were derived from the same species.
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.
(Genetics) (of cells, organisms, etc) having more than two sets of haploid chromosomes inherited from a single species
(Genetics) an organism or cell of this type
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014