Where does “lom” come from?

lom (Czech) comes from Old Czech lom, from Proto-Slavic lomъ, from Proto-Slavic lomiti, from Proto-Indo-European h₃lemH- — broken; weak, broken, soft.

lom (Czech): An open mine; Diffraction or refraction;...

Definitions

An open mine; Diffraction or refraction;...

Ancestry of “lom”, step by step

Step	Language	Word	Meaning
1	Old Czech	lom	—
2	Proto-Slavic	lomъ	crowbar; fracture, breakage
3	Proto-Slavic	lomiti	to break
4	Proto-Indo-European	h₃lemH-	broken; weak, broken, soft

Words derived from “lom”

Every word from Proto-Indo-European h₃lemH- →Every word from Proto-Slavic lomiti →Every word from Proto-Slavic lomъ →