Where does “मूष” come from?

मूष (Sanskrit) comes from Proto-Indo-Iranian múHs, from Proto-Indo-European múh₂s — mouse.

Ancestry of “मूष”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-Iranian	múHs	mouse
2	Proto-Indo-European	múh₂s	mouse

मूष — Etymology, Origin & Word History | Etymology Explorer