pterygium /ter-ijˈi-əm or pter-ijˈi-əm/

1. A vertebrate limb (zoology)
2. A winglike growth (biology)
3. A wing-shaped area of thickened conjunctiva which spreads over part of the cornea and sometimes over the eyeball (medicine)

pterygˈial adjective

Of or relating to a wing or fin

A bone in a fin

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