apophony
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a·poph·o·ny
(ə-pŏf′ə-nē)n.
See ablaut.
a·poph′o·nic (-nĭk) adj.
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.
apophony
(əˈpɒfənɪ)n
a change in the quality of a vowel sound to indicate grammatical change
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014