Where does “ἄπυρος” come from?

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

ἄπυρος (Ancient Greek): Without fire, fireless

Definitions

Without fire, fireless

Ancestry of “ἄπυρος”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ἀ-	The alpha privativum, used to make words that...
2	Proto-Hellenic	hə-	same; together
3	Proto-Indo-European	sm̥-	one; with, together
4	Proto-Indo-European	sem-	together, one

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