- Proto-Hind-Ewropaki ra *splegh- ("serpez")
- Proto-Aryaki ra
- Ewıstki: spereza- ("serpez")
- Pehlewki: spārz ("serpez")
- Hotenki: spuljei ("serpez")
- Farski: sipurz ("serpez")
- Kurmancki: sipil ("serpez")
- (Zazaki: sarpaz) Alfabeyê Ariki
- Sanskritki: plīhan- ("serpez")
- Ermenki: p'aicaln ("serpez")
- Yunanki: splen ("serpez")
- Latinki: splen ("serpez") < Yunanki: σπλήν splḗn
- Horn, Paul. Dictionary of Persian Etymology (Strassburg, 1893),
- Watkins, Calvert. The American Heritage Dictionary of Indo-European Roots, 2nd ed., Houghton Mifflin Co., 2007. *Amazon.com ra,
- Etymonline. Online English Etymology Dictionary. <etymonline.com> by Douglas Harper.
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