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Latin word mirus comes from Proto-Indo-European *smey-.

Mirus etymology ?

Mirus detailed word origin explanation

Dictionary entryLanguageDefinition
*smey- Proto-Indo-European (ine-pro)
*sméyros Proto-Indo-European (ine-pro)
*smeiros Proto-Italic (itc-pro)
mirus Latin (lat) Wonderful, marvelous, amazing, surprising, awesome.