Where does “exacuendus” come from?

exacuendus (Latin) comes from Latin exacuo, from Latin acuō, from Latin acus, from Proto-Italic akus, from Proto-Indo-European h₂eḱus, from Proto-Indo-European h₂eḱ- — sharp.

exacuendus (Latin): which is to be sharpened

Definitions

which is to be sharpened

Ancestry of “exacuendus”, step by step

Step	Language	Word	Meaning
1	Latin	exacuo	I sharpen; I stimulate or aggravate
2	Latin	acuō	to make pointed, sharpen, whet
3	Latin	acus	a needle, a pin; bodkin; bran, awn, chaff
4	Proto-Italic	akus	—
5	Proto-Indo-European	h₂eḱus	—
6	Proto-Indo-European	h₂eḱ-	sharp

Every word from Proto-Indo-European h₂eḱ- →Every word from Proto-Indo-European h₂eḱus →Every word from Proto-Italic akus →