Where does “громъ” come from?
громъ (Old Church Slavonic) comes from Proto-Slavic gromъ, from Proto-Indo-European gʰrom-o-, from Proto-Indo-European gʰrem-, from Proto-Indo-European gʰer- — to rub; to stroke; to grind.
громъ (Old Church Slavonic): thundering
Ancestry of “громъ”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Proto-Slavic | gromъ | thunder |
| 2 | Proto-Indo-European | gʰrom-o- | — |
| 3 | Proto-Indo-European | gʰrem- | to be angry; to sound, bellow, growl, roar, be... |
| 4 | Proto-Indo-European | gʰer- | to rub; to stroke; to grind |