Where does “rugose” come from?

rugose (Latin) comes from Latin rugosus, from Latin rūga, from Proto-Indo-European krewp-, from Proto-Indo-European krew- — to fall, collapse; scab; to fall, break, bruise.

rugose (Latin): vocative masculine singular of rūgōsus

Definitions

vocative masculine singular of rūgōsus

Ancestry of “rugose”, step by step

Step	Language	Word	Meaning
1	Latin	rugosus	wrinkled; shrivelled
2	Latin	rūga	a crease in the face, wrinkle
3	Proto-Indo-European	krewp-	scab, crust; to become encrusted
4	Proto-Indo-European	krew-	to fall, collapse; scab; to fall, break, bruise

Every word from Proto-Indo-European krew- →Every word from Proto-Indo-European krewp- →Every word from Latin rūga →