Where does “stromat-” come from?

stromat- (Latin) comes from Ancient Greek στρῶμα, from Proto-Hellenic strṓmə, from Proto-Indo-European sterh₃-, from Proto-Indo-European ster- — sterile, infertile.

stromat- (Latin): bed covering

Definitions

bed covering

Ancestry of “stromat-”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	στρῶμα	mattress, bed; bedclothes; horsecloth
2	Proto-Hellenic	strṓmə	—
3	Proto-Indo-European	sterh₃-	to spread, extend, stretch out
4	Proto-Indo-European	ster-	sterile, infertile

Every word from Proto-Indo-European ster- →Every word from Proto-Indo-European sterh₃- →Every word from Proto-Hellenic strṓmə →