Where does “deraign” come from?

deraign (English) comes from Middle English dereynen, from Old French deraisnier, from Latin derationo, from Latin ratiō, from Latin -tiō, from Latin dissertātiō, from Latin dissertus, from Latin disserere — small stone, pebble; gravel, rubble.

deraign (English): To prove or to refute by proof, especially on...

Definitions

To prove or to refute by proof, especially on...

Ancestry of “deraign”, step by step

Step	Language	Word	Meaning
1	Middle English	dereynen	To fight for; to contest in battle
2	Old French	deraisnier	to explain; to justify
3	Latin	derationo	—
4	Latin	ratiō	reason, reasoning, explanation, ground, motive, rationality, rationale, purpose
5	Latin	-tiō	tion, -ation, -ing
6	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
7	Latin	dissertus	arranged, disposed; explained
8	Latin	disserere	second-person singular future passive indicative...
9	Latin	dis-	asunder, apart, in two; reversal, removal;...
10	Latin	calceus	shoe
11	Latin	calx	limestone; chalk; the finish line
12	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

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