Where does “demi-droite” come from?

demi-droite (French) comes from French droite, from French droit, from Old French droit, from Late Latin drictus, from Latin dīrectus, from Latin dīrigō, from Latin dis-, from Latin calceus — small stone, pebble; gravel, rubble.

demi-droite (French): ray, half-line

Definitions

ray, half-line

Ancestry of “demi-droite”, step by step

Step	Language	Word	Meaning
1	French	droite	feminine singular of droit; straight line; the...
2	French	droit	right; law; right angle
3	Old French	droit	justice, right; right; correct; justified; right
4	Late Latin	drictus	—
5	Latin	dīrectus	laid straight, arranged in lines, having been arranged in lines
6	Latin	dīrigō	to lay straight; arrange in lines (especially in military contexts)
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

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