Arabic

firsin- - lowest part of the leg of a camel (BK 2 569, Lane 2369)

PWS
*pVrs- - hoof (SED I No. 220; Kogan 2011: 226)
Traditionally identified with Sem. verb *prs ‘to divide; break’ (cf., for example, HALOT 969); this looks a typical folk etymology as even in the Bible, this term conspicuously denotes both divided and non-divided hoof.