Akkadian

durāˀu - arm, foreleg (CAD D 190, AHw. 177)

d instead of the expected z suggests a borrowing from Arm.; in this case -u of the first syllable would reflect early Arm. *-u, the vocalism possibly confirmed by the Amarna form (SED I No. 65, Abraham–Sokoloff 2011:29).

PWS

*ḏirāˁ- - arm, elbow (SED I 65, Kogan 2011: 224)

The traditional derivation from *ḏrˁ ‘to sow’ (Fronzaroli 1964:34, 48 and 1969:9) is difficult to prove