Where does “pinasse” come from?

pinasse (Middle French) comes from Spanish pinaza, from Spanish pino, from Latin pīnus, from Proto-Indo-European poi- — sap, juice.

Ancestry of “pinasse”, step by step

Step	Language	Word	Meaning
1	Spanish	pinaza	pinnace; dead leaves from a pine tree
2	Spanish	pino	pine
3	Latin	pīnus	pine tree, fir tree
4	Proto-Indo-European	poi-	sap, juice