Where does “stelna” come from?

stelna (Swedish) comes from Old Swedish stirdhna, from Old Norse stirðna.

stelna (Swedish): to set; to stiffen; to become stiff

Definitions

Step	Language	Word	Meaning
1	Old Swedish	stirdhna	—
2	Old Norse	stirðna	—

stelna — Etymology, Origin & Word History | Etymology Explorer