a combining form meaning “fish,” used in the formation of compound words: ichthyology.
Also, especially before a vowel, ichthy-.

< Greek, combining form of ichthŷs fish

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World English Dictionary
ichthyo- or (before a vowel) ichthy-
combining form
indicating or relating to fishes: ichthyology
[from Latin, from Greek ikhthus fish]
ichthy- or (before a vowel) ichthy-
combining form
[from Latin, from Greek ikhthus fish]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

ichthyo- or ichthy-
Fish: ichthyoid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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