Cf. also wāriyat-, waraⁿ ‘lung disease’ (BK 2 1526). In these forms, w- could be regarded as a secondary element (a triconsonantizer?) if not for a comparison to Berb. and C. Chad. terms in w- which makes one suppose them to be a vestige of the old Afras. form *wVray/ˀ-.
Usually compared to Akk. irtu, Ugr. ˀirt. ‘breast’; reconstruction of two different roots probably related by metathesis (cf. *ˀir(r)-at- ‘chest, breast’) is preferable.