SEDonline
Semitic Etymological Database
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Arabic
kusˀ-, kusy- - rear, last part, backside, behind, behind of the head
(BK 2 894, WKAS I 168)
Reconstruction
PS
*ka/iska/is-, *kVsˀw-
- back, side or front part of body (of a sheep?)
(SED No. 152)
A difficult case: meanings and stem patterns differ greatly.