• Webster's Revised Unabridged Dictionary
    • n Propterygium (Anat) The anterior of three principal cartilages in the fins of some fishes.
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Century Dictionary and Cyclopedia
    • n propterygium In ichthyology, the foremost one of three basal cartilages which the pterygium of a fish, as an elasmobranch, may present. See pterygium.
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Chambers's Twentieth Century Dictionary
    • n Propterygium prō-tē-rij′i-um the anterior basal cartilage of the fins in the Elasmobranchii
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. before + a fin
Chambers's Twentieth Century Dictionary
L. pro, before, L.,—Gr. pterygion, a fin, pteron, a wing.


In literature:

It constitutes the (at this stage undivided) rudiment of the mesopterygium and propterygium of Gegenbaur.
"The Works of Francis Maitland Balfour, Volume 1" by Francis Maitland Balfour