Where does “indurescens” come from?

indurescens (Latin) comes from Latin indūrēscō, from Latin duresco, from Latin dūrus, from Proto-Italic dūros, from Proto-Indo-European duh₂-ró-s, from Proto-Indo-European dweh₂- — far; long.

Definitions

Ancestry of “indurescens”, step by step

Step	Language	Word	Meaning
1	Latin	indūrēscō	to harden, set, become hard
2	Latin	duresco	I harden
3	Latin	dūrus	—
4	Proto-Italic	dūros	—
5	Proto-Indo-European	duh₂-ró-s	long, far
6	Proto-Indo-European	dweh₂-	far; long

Every word from Proto-Indo-European dweh₂- →Every word from Proto-Indo-European duh₂-ró-s →Every word from Proto-Italic dūros →