- Proto-Hindo-Ewropaki ra *ar ("to fit together") > *ar-mo ("erme")
- Proto-Aryaki ra ?
- Ewıstki: aremo- ("erme")
- Pehlewki: arm ("erme")
- Farski: arm ("erme")
- Osetki: arm ("erme")
- (Zazaki: arma) Alfabeyê Ariki
- Sanskritki: irmah ("erme")
- Latinki: armus ("doş")
- Yunanki: harmos ("joint")
- Almanki: arm ("erme")
- İngılızki: arm ("erme")
- 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.,
- Julius Pokorny's Indo-European Etymological Dictionary
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