Where does “ars” come from?

ars (Middle English) comes from Old French arz, from Latin artes, from Latin ars, from Proto-Italic artis, from Proto-Indo-European h₂értis, from Proto-Indo-European h₂er- — to fit, to fix, to put together.

ars (Middle English): arse, anus; bottom, buttocks; plural of art

Definitions

arse, anus; bottom, buttocks; plural of art

Ancestry of “ars”, step by step

ars traces back through two separate lines of ancestry.

via Old French arz

Step	Language	Word	Meaning
1	Old French	arz	—
2	Latin	artes	second-person singular present active subjunctive...
3	Latin	ars	art; skill, craft, handicraft, trade, power
4	Proto-Italic	artis	—
5	Proto-Indo-European	h₂értis	fitting
6	Proto-Indo-European	h₂er-	to fit, to fix, to put together

via Old English ærs

Step	Language	Word	Meaning
1	Old English	ærs	Alternative form of ears
2	Proto-West Germanic	ars	arse, anus, buttocks
3	Proto-Germanic	arsaz	arse/ass, anus, buttocks
4	Proto-Indo-European	h₁orsos	arse

Words derived from “ars”

Every word from Proto-Indo-European h₂er- →Every word from Proto-Indo-European h₂értis →Every word from Proto-Italic artis →