Where does “ellagitannin” come from?

ellagitannin (English) comes from English ellagic, from French galle, from Latin galla, from Gaulish gallā, from Proto-Germanic gallǭ, from Proto-Indo-European ǵʰelh₃- — to flourish; green, yellow.

ellagitannin (English): Any of a group of tannins, related to ellagic...

Definitions

Any of a group of tannins, related to ellagic...

Ancestry of “ellagitannin”, step by step

ellagitannin traces back through two separate lines of ancestry.

via English ellagic

Step	Language	Word	Meaning
1	English	ellagic	Of or pertaining to gallnuts
2	French	galle	gall
3	Latin	galla	the oak apple, gall-nut; a harsh, sour kind of...
4	Gaulish	gallā	vessel
5	Proto-Germanic	gallǭ	gall, bile
6	Proto-Indo-European	ǵʰelh₃-	to flourish; green, yellow

via English tannin

Step	Language	Word	Meaning
1	English	tannin	Tannic acid or any of its derivatives
2	French	tannin	—
3	Latin	tannum	oak bark
4	Gaulish	tannos	—
5	Proto-Celtic	tannos	green oak
6	Proto-Indo-European	dʰonu	fir

Every word from Proto-Indo-European ǵʰelh₃- →Every word from Proto-Germanic gallǭ →Every word from Gaulish gallā →