Where does “pectine” come from?

pectine (French) comes from Ancient Greek πηκτικός, from Ancient Greek πήγνυμι, from Proto-Indo-European peh₂ǵ- — to attach.

Ancestry of “pectine”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	πηκτικός	congealed, curdled; curdling
2	Ancient Greek	πήγνυμι	I secure, stick in, fix on; I fasten, put...
3	Proto-Indo-European	peh₂ǵ-	to attach

pectine — Etymology, Origin & Word History | Etymology Explorer