Where does “exoperitrophic” come from?

exoperitrophic (English) comes from English peritrophic, from English peri, from Ottoman Turkish پری, from Persian پری, from Persian پر, from Middle Persian purr, from Proto-Iranian pr̥Hnáh, from Proto-Indo-Iranian pr̥Hnás — to fill.

Ancestry of “exoperitrophic”, step by step

StepLanguageWordMeaning
1EnglishperitrophicDescribing a tubular chitinous sheath that lines...
2EnglishperiA sprite or supernatural being
3Ottoman Turkishپریfairy
4Persianپریsprite or supernatural being in Iranian/Persian...
5Persianپرfull; feather; wing
6Middle Persianpurr
7Proto-Iranianpr̥Hnáhfull, filled
8Proto-Indo-Iranianpr̥Hnásfull, filled
9Proto-Indo-Europeanpl̥h₁nósfull
10Proto-Indo-Europeanpleh₁-to fill
Every word from Proto-Indo-European pleh₁-