SEDonline
Semitic Etymological Database
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PS
*ˀir(r)-at- - chest, breast
(SED I No. 9)
Words
Akkadian
irtu
- chest, breast
(CAD I 183, AHw. 386)
Ugaritic
ˀirt
- breast
(DUL 110)
Tigre
ˀarra, pl. ˀarratat (poet. ˀaratat)
- milt, by-stomach (of cattle)
(WTS 357)
A semantic shift ‘chest’ > ‘viscera’ is quite common.