Where does “stethi” come from?

stethi (Middle English) comes from Old Norse steði, from Old Norse -i, from Latin -ē, from Latin dis-, from Latin calceus, from Latin calx, from Ancient Greek χάλιξ — small stone, pebble; gravel, rubble.

Ancestry of “stethi”, step by step

Step	Language	Word	Meaning
1	Old Norse	steði	anvil
2	Old Norse	-i	th
3	Latin	-ē	ly; used to form adverbs from adjectives
4	Latin	dis-	asunder, apart, in two; reversal, removal;...
5	Latin	calceus	shoe
6	Latin	calx	limestone; chalk; the finish line
7	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

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