Where does “ἱδρωτικός” come from?

ἱδρωτικός (Ancient Greek) comes from Ancient Greek ἱδρώς, from Proto-Indo-European swidrōs, from Proto-Indo-European sweyd- — sweat; to sweat.

Ancestry of “ἱδρωτικός”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ἱδρώς	sweat, perspiration; gum, sap; juice, moisture
2	Proto-Indo-European	swidrōs	—
3	Proto-Indo-European	sweyd-	sweat; to sweat

ἱδρωτικός — Etymology, Origin & Word History | Etymology Explorer