ichthyopterygium

noun
ich·​thy·​op·​te·​ryg·​i·​um | \-jēəm\
plural ichthyopterygia\ -​jēə \

Definition of ichthyopterygium 

: the vertebrate limb when having the form of a fin whether as a definitive organ or in the course of individual or evolutionary development especially : any of the paired fins that are the typical limbs of fishes — compare chiropterygium

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History and Etymology for ichthyopterygium

New Latin, from ichthy- + Greek pterygion small wing, fin, diminutive of pteryg-, pteryx wing

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