Where does “testis” come from?

testis (Serbo-Croatian) comes from Latin testis, from Latin terstis, from Latin trīstis, from Proto-Indo-European tristh₂s, from Proto-Indo-European steh₂- — to stand.

testis (Serbo-Croatian): testicle

Definitions

testicle

Ancestry of “testis”, step by step

Step	Language	Word	Meaning
1	Latin	testis	witness; one who testifies or attests; testicle
2	Latin	terstis	—
3	Latin	trīstis	sad, unhappy, melancholy, morose
4	Proto-Indo-European	tristh₂s	a third party standing, after the two parties to...
5	Proto-Indo-European	steh₂-	to stand

Every word from Proto-Indo-European steh₂- →Every word from Proto-Indo-European tristh₂s →Every word from Latin trīstis →