Where does “Mare Hibernicum” come from?

Mare Hibernicum (Latin) comes from Latin mare, from Proto-Italic mari, from Proto-Indo-European móri, from Proto-Indo-European mer- — to die; to disappear; sea, lake, wetland.

Ancestry of “Mare Hibernicum”, step by step

Mare Hibernicum traces back through two separate lines of ancestry.

via Latin mare

StepLanguageWordMeaning
1Latinmaresea; ablative singular of mās
2Proto-Italicmarisea
3Proto-Indo-Europeanmórisea; standing water
4Proto-Indo-Europeanmer-to die; to disappear; sea, lake, wetland

via Latin hibernicus

StepLanguageWordMeaning
1LatinhibernicusIrish, of or pertaining to the Irish people;...
Every word from Proto-Indo-European mer-Every word from Proto-Indo-European móriEvery word from Proto-Italic mari