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Having unequal or differing parts within the same structure or similar structures.
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.


(Biology) biology having or consisting of parts that differ, esp in number
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌhɛt əˈrɒm ər əs)

Biol. having parts that differ in quality, number of elements, or the like.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Numerous Lamellicorn and Heteromerous insects, the latter remarkable for their deeply sculptured bodies, were slowly crawling about; while the lizard tribe, the constant inhabitants of a sandy soil, darted about in every direction.
We ask whether, in numerous other lichens with a "heteromerous" thallus, photobiont layer mimics the bark-tissues of the endophloeodal habitat or the rock pores of the endolithic habitat.
(10) It is perhaps worth noting that the sum/rigid-embodiment distinction is unrelated to the distinction, often made in the literature on stuffs and mass terms, between "heteromerous" and "homeomerous" stuff-kinds.