Comment: Cf. also Rut. (derived) a=lḳa-d 'lame', Tsakh. Gelm. ḳawa-na id. The Tsakh. and Ud. forms are metathesized.
Vinogradova-Klimov 1979 proposed to consider the Tsakh. and Ud. forms as loans from Armenian (Arm. kaɫ 'lame'); but the Armenian word has no secure IE etymology and should rather itself be regarded as one of the numerous Caucasian loanwords.
