Where does “thesauri” come from?

thesauri (Latin) comes from Latin thesaurus, from Ancient Greek θησαυρός, from Ancient Greek τίθημι, from Proto-Indo-European dʰeh₁- — to do, put, place.

thesauri (Latin): nominative plural of thēsaurus; genitive singular...

Definitions

nominative plural of thēsaurus; genitive singular...

Ancestry of “thesauri”, step by step

Step	Language	Word	Meaning
1	Latin	thesaurus	treasure, hoard; a dear friend, loved one; a...
2	Ancient Greek	θησαυρός	treasure; vault, repository, chest
3	Ancient Greek	τίθημι	I put, place, set; I make, cause to be; I make
4	Proto-Indo-European	dʰeh₁-	to do, put, place

Every word from Proto-Indo-European dʰeh₁- →Every word from Ancient Greek τίθημι →Every word from Ancient Greek θησαυρός →