Where does “poysone” come from?

poysone (Middle English) comes from Old French poison, from Latin pōtiō, from Latin -tiō, from Latin dissertātiō, from Latin dissertus, from Latin disserere, from Latin dis-, from Latin calceus — small stone, pebble; gravel, rubble.

poysone (Middle English): Alternative form of poisoun

Definitions

Alternative form of poisoun

Ancestry of “poysone”, step by step

poysone traces back through two separate lines of ancestry.

via Old French poison

Step	Language	Word	Meaning
1	Old French	poison	poison; potion
2	Latin	pōtiō	drinking
3	Latin	-tiō	tion, -ation, -ing
4	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
5	Latin	dissertus	arranged, disposed; explained
6	Latin	disserere	second-person singular future passive indicative...
7	Latin	dis-	asunder, apart, in two; reversal, removal;...
8	Latin	calceus	shoe
9	Latin	calx	limestone; chalk; the finish line
10	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

via Old French puison

Step	Language	Word	Meaning
1	Old French	puison	—
2	Latin	potio	drinking; drink, draught, potion
3	Latin	potare	present active infinitive of pōtō; second-person...
4	Latin	poto	I drink

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