Arabic

ḥišwat­-, ḥašwat-, ḥašaⁿ - viscera (any interior part of the body); intestines (BK 1 435)

Also maḥšaⁿ ‘stomach’ (BK 1 436); ḥašaⁿ ‘painful breathing; asthma’; ḥašiⁿ ‘painful breathing’; ḥšy ‘have asthma’ [ibid.]; semantic shifts from the unattested/lost meaning ‘lung’.

PS
*ḥaŝy- - entrails (SED I No. 128)
Originally may have a more specified meaning ‘lung(s)’ (in Akk.) and ‘asthma’ (in some of the Arb. forms and in Sab.)