Arabic

ḥammāmat- - middle of chest, chest, breastbone, etc. (BK 1 487)

There are two other anatomical terms which are, however, difficult to compare for semantic reasons: ḥammāˀ- ‘fesses’ [ibid. 486] and ḥamm­-, ḥammat-­ ‘fat tail of melted sheep’ [ibid.] (an original meaning likely to be ‘fat tail of a sheep’, the meaning ‘melted’ acquired through contamination with the homonymous verb ḥmm ‘chauffer’ [ibid. 485]

PS
*ḥVmm(-at)- - breast, stomach, entrails (SED I No. 119)
Both vocalic and semantic reconstruction is rather amorphous.