Where does “citre” come from?

citre (Middle French) comes from Vulgar Latin cithera, from Latin cithara, from Ancient Greek κιθάρα — lyre; the ribs of the horse; ivy.

Ancestry of “citre”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	cithera	—
2	Latin	cithara	cithara, lyre, lute, guitar; guitar
3	Ancient Greek	κιθάρα	lyre; the ribs of the horse; ivy