Where does “eucalyptus” come from?

eucalyptus (New Latin) comes from Ancient Greek εὖ, from Ancient Greek ἐΰς, from Proto-Hellenic ehu-, from Proto-Indo-European h₁su-, from Proto-Indo-European h₁wes- — good; to be cheerful, happy; to eat, to feast.

Ancestry of “eucalyptus”, step by step

eucalyptus traces back through two separate lines of ancestry.

via Ancient Greek εὖ

Step	Language	Word	Meaning
1	Ancient Greek	εὖ	well
2	Ancient Greek	ἐΰς	good, brave, noble
3	Proto-Hellenic	ehu-	good
4	Proto-Indo-European	h₁su-	good
5	Proto-Indo-European	h₁wes-	good; to be cheerful, happy; to eat, to feast

via Ancient Greek καλυπτός

Step	Language	Word	Meaning
1	Ancient Greek	καλυπτός	covered
2	Ancient Greek	καλύπτω	to cover; to put over as a covering
3	Proto-Indo-European	ḱel-	to cover; to incline

Words derived from “eucalyptus”

eukalyptus
eukalyptus
Eukalyptus
Eukalyptusbonbon

Every word from Proto-Indo-European h₁wes- →Every word from Proto-Indo-European h₁su- →Every word from Proto-Hellenic ehu- →