meaning very uncertain (cf. Pardee 1985: 62‒63), but there is hardly a connection with any of the Akkadian lexemes mentioned in Watson 2007: 70. An Akkadian borrowing in Ugaritic is very unlikely.
Ugaritic
rˀuš - disease of the head
(DUL 726, Watson 2007: 102)
highly uncertain, borrowing from Akk. rāšānu ‘a disease’ (CAD R 191) is unprovable.