Where does “quitina” come from?

quitina (Old High German) comes from Latin quidonia, from Latin cotōneum, from Ancient Greek κυδώνιον.

Ancestry of “quitina”, step by step

Step	Language	Word	Meaning
1	Latin	quidonia	—
2	Latin	cotōneum	—
3	Ancient Greek	κυδώνιον	—

quitina — Etymology, Origin & Word History | Etymology Explorer