Unknown.
Reconstruction notes
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In the Chechen and Ingush archaic form, vowel /a/ is explained analogy with the form of the oblique stem.
*ko
- hand (part of the forelimb)
- Bats: ქო (ko)
- Vainakh:
- *ku-H-iḳ (H-epenthesis, diminutive derivational suffix)
- Chechen: куьг (küg)
- →? Ossetian: къух (k’ux)
- *ku-l-iḳ (l-epenthesis, diminutive derivational suffix)
- *ka
- Chechen: ка (ka) (archaic)
- Ingush: кa (ka) (archaic)
- Ingush: кo (ko, “handle”)