Akkadian

ašû - a disease (affecting the head, vision, etc.) (CAD A₂ 476, AHw. 85)

Var. ḫašû, ušû

PS
*ˁaw/yš-, *ˁašw/y- - kind of disease (fever, cold in the head; plague) (SED I No. 27)
The Akk. variant form with ḫ- may also suggest γ-. The ESA and Jib. forms, however, clearly point to ˁ-.