ˀaddīr - mighty, magnificent (HALOT 13‒14)

Cf. perhaps Tna. ˀaddärä ‘to heap up, to amass, to collect’ (TED 1530), which would point to PWS *ˀdr ‘to be massive.’ In DRS 10, PC *ˀdr is compared to Arb. ˀudrat- ‘scrotal hernia’