Where does “سدس” come from?

سدس (Arabic) comes from Arabic د, from Arabic اِسْتَخْدَمَ — to use, hire.

سدس (Arabic): one sixth

Definitions

Step	Language	Word	Meaning
1	Arabic	د	—
2	Arabic	اِسْتَخْدَمَ	to use, hire

سدس — Etymology, Origin & Word History | Etymology Explorer