Where does “séptuplo” come from?

séptuplo (Portuguese) comes from Latin septuplus, from Latin -plus, from Latin plicāre, from Proto-Indo-European pleḱ-, from Proto-Indo-European pel- — to cover, to wrap; skin, hide, cloth; to fold.

Ancestry of “séptuplo”, step by step

Step	Language	Word	Meaning
1	Latin	septuplus	sevenfold, septuple
2	Latin	-plus	-fold
3	Latin	plicāre	—
4	Proto-Indo-European	pleḱ-	to fold, plait, weave
5	Proto-Indo-European	pel-	to cover, to wrap; skin, hide, cloth; to fold

Every word from Proto-Indo-European pel- →Every word from Proto-Indo-European pleḱ- →Every word from Latin -plus →