Where does “discubiturus” come from?

discubiturus (Latin) comes from Latin discumbo, from Latin dis-, from Latin calceus, from Latin calx, from Ancient Greek χάλιξ — small stone, pebble; gravel, rubble.

Definitions

Ancestry of “discubiturus”, step by step

Step	Language	Word	Meaning
1	Latin	discumbo	I lie down; I recline at table
2	Latin	dis-	asunder, apart, in two; reversal, removal;...
3	Latin	calceus	shoe
4	Latin	calx	limestone; chalk; the finish line
5	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

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