Where does “cul-de-sac” come from?

cul-de-sac (French) comes from French cul, from Middle French cul, from Old French cul, from Latin cūlus, from Proto-Celtic kūlos, from Proto-Indo-European ḱuH-ló-, from Proto-Indo-European (s)kewH- — to cover, bedeck; cover.

cul-de-sac (French): dead end, cul-de-sac; impasse

Definitions

dead end, cul-de-sac; impasse

Ancestry of “cul-de-sac”, step by step

cul-de-sac traces back through two separate lines of ancestry.

via French cul

Step	Language	Word	Meaning
1	French	cul	butt, bum, ass, arse; anus; arsehole; asshole;...
2	Middle French	cul	arse; ass; anus
3	Old French	cul	bottom; the buttock
4	Latin	cūlus	the arse, ass
5	Proto-Celtic	kūlos	corner
6	Proto-Indo-European	ḱuH-ló-	—
7	Proto-Indo-European	(s)kewH-	to cover, bedeck; cover

via French de

Step	Language	Word	Meaning
1	French	de	of; from; used attributively, often translated...
2	Latin	de	The name of the letter "D"; of, concerning,...
3	Proto-Indo-European	de	Emphatic or contrastive particle, and, but;...

Words derived from “cul-de-sac”

Every word from Proto-Indo-European (s)kewH- →Every word from Proto-Indo-European ḱuH-ló- →Every word from Proto-Celtic kūlos →