Where does “lethargus” come from?

lethargus (Latin) comes from Ancient Greek λήθαργος, from Ancient Greek ἀργός, from Ancient Greek ἀ-, from Proto-Hellenic hə-, from Proto-Indo-European sm̥-, from Proto-Indo-European sem- — together, one.

lethargus (Latin): lethargy, drowsiness

Definitions

lethargy, drowsiness

Ancestry of “lethargus”, step by step

lethargus traces back through two separate lines of ancestry.

via Ancient Greek λήθαργος

Step	Language	Word	Meaning
1	Ancient Greek	λήθαργος	forgetful; lethargic; lethargy
2	Ancient Greek	ἀργός	white, bright; swift; not working, idle
3	Ancient Greek	ἀ-	The alpha privativum, used to make words that...
4	Proto-Hellenic	hə-	same; together
5	Proto-Indo-European	sm̥-	one; with, together
6	Proto-Indo-European	sem-	together, one

via Ancient Greek λήθᾱργος

Step	Language	Word	Meaning
1	Ancient Greek	λήθᾱργος	forgetful

Words derived from “lethargus”

Every word from Proto-Indo-European sem- →Every word from Ancient Greek ἀ- →Every word from Proto-Indo-European sm̥- →