likely related, along with Akk erpetu - ‘cloud’ with metathesis to *ˁapar- ‘cloud’ in continental MSA
probably an ultimate connection to *γarpill- - storm cloud
ˁṯrb - an ingredient or medicine in the hippiatric texts
(DUL 193, Watson 2007: 67)
hardly any connection with Akk. azupīru ‘a garden plant used as a spice and for medicinal purposes’. In view of Arb. ˁuṯrub- the Akkadian borrowing in Ugaritic becomes, in any case, superfluous (Kogan 2015: 361).