Where does “smród” come from?

smród (Polish) comes from Proto-Slavic smȏrdъ, from Proto-Balto-Slavic smorʔdos, from Proto-Indo-European smord-o-s.

smród (Polish): stink, stench

Definitions

Step	Language	Word	Meaning
1	Proto-Slavic	smȏrdъ	—
2	Proto-Balto-Slavic	smorʔdos	—
3	Proto-Indo-European	smord-o-s	—

smród — Etymology, Origin & Word History | Etymology Explorer