Where does “زلزله‌ای” come from?

زلزله‌ای (Persian) comes from Persian ـی, from Middle Persian -yk', from Old Persian -𐎡𐎣, from Proto-Indo-Iranian -kas, from Proto-Indo-European -ḱos — -y, -ic.

زلزله‌ای (Persian): seismic

Definitions

seismic

Ancestry of “زلزله‌ای”, step by step

زلزله‌ای traces back through two separate lines of ancestry.

via Persian ـی

Step	Language	Word	Meaning
1	Persian	ـی	Forms nouns or adjectives from nouns; Forms...
2	Middle Persian	-yk'	—
3	Old Persian	-𐎡𐎣	of, pertaining to, belonging to, related to
4	Proto-Indo-Iranian	-kas	Creates deadjectival and desubstantival...
5	Proto-Indo-European	-ḱos	-y, -ic

via Persian زلزله

Step	Language	Word	Meaning
1	Persian	زلزله	earthquake, seism
2	Arabic	زَلْزَلَة	—

Every word from Proto-Indo-European -ḱos →Every word from Middle Persian -yk' →Every word from Persian ـی →