Where does “juis” come from?

juis (Middle English) comes from Old French jus, from Latin iūs, from Latin dīcō, from Latin -tiō, from Latin dissertātiō, from Latin dissertus, from Latin disserere, from Latin dis- — small stone, pebble; gravel, rubble.

Ancestry of “juis”, step by step

juis traces back through two separate lines of ancestry.

via Old French jus

Step	Language	Word	Meaning
1	Old French	jus	juice; down
2	Latin	iūs	law, right
3	Latin	dīcō	to say, talk, speak, utter, mention
4	Latin	-tiō	tion, -ation, -ing
5	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
6	Latin	dissertus	arranged, disposed; explained
7	Latin	disserere	second-person singular future passive indicative...
8	Latin	dis-	asunder, apart, in two; reversal, removal;...
9	Latin	calceus	shoe
10	Latin	calx	limestone; chalk; the finish line
11	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

via Old French jous

Step	Language	Word	Meaning
1	Old French	jous	—
2	Latin	ius	law, right; subjective right, individual right;...

Every word from Ancient Greek χάλιξ →Every word from Latin -tiō →Every word from Latin dis- →