Where does “oestriclus” come from?

oestriclus (Vulgar Latin) comes from Latin oestriculus, from Latin oestrus, from Ancient Greek οἶστρος, from Proto-Indo-European h₁eysh₂- — to strengthen; to propel.

Ancestry of “oestriclus”, step by step

Step	Language	Word	Meaning
1	Latin	oestriculus	—
2	Latin	oestrus	gadfly
3	Ancient Greek	οἶστρος	gadfly, breese; a sting, anything that drives mad
4	Proto-Indo-European	h₁eysh₂-	to strengthen; to propel

Every word from Proto-Indo-European h₁eysh₂- →Every word from Ancient Greek οἶστρος →Every word from Latin oestrus →