- Proto-Hind-Ewropaki ra *gel- ("serd, serd biyayene")
- Proto-Aryaki ra
- Ewıstki: sareta- ("serd")
- Pehlewki: sard- ("serd")
- Partki: srd- ("serd")
- Soğdki: srt- ("serd")
- Farski: sard ("serd")
- Kurmancki: sār ("serd")
- Belucki: sart ("serd")
- Osetki: sald ("serd")
- Goranki: sard ("serd")
- (Zazaki: sard) Alfabeyê Ariki
- Latinki: gelū ("serd")
- Almanki: kalt ("serd")
- İngılızki: cold ("serd")
- Horn, Paul. Dictionary of Persian Etymology (Strassburg, 1893),
- J. Cheung, Etymological Dictionary of the Iranian Verb. Leiden 2007.,
- Watkins, Calvert. The American Heritage Dictionary of Indo-European Roots, 2nd ed., Houghton Mifflin Co., 2007. *Amazon.com ra,
- MacKenzie, David Neil. The dialect of Awroman (Hawraman-i Luhon) Grammatical sketch, texts, and vocabulary. 1966, Kommissionaer: Munksgaard (København).,
- Etymonline. Online English Etymology Dictionary. <etymonline.com> by Douglas Harper.
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