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Having or designating floral whorls with equal numbers of parts in each whorl.
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.
1. (Biology) having an equal number of parts or markings
2. (Botany) (of flowers) having floral whorls with the same number of parts. Compare anisomerous
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
i•som•er•ous(aɪˈsɒm ər əs)
1. having an equal number of parts, markings, etc.
2. (of a flower) having the same number of members in each whorl.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.