Where does “apsida” come from?

apsida (Serbo-Croatian) comes from Ancient Greek ἁψίς, from Ancient Greek -σῐς, from Ancient Greek -τις, from Proto-Indo-European -tis — Derives abstract/action nouns from verb roots.

apsida (Serbo-Croatian): apse

Definitions

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Ancestry of “apsida”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ἁψίς	net, mesh; wheel, hoop, disc; Any curved form:...
2	Ancient Greek	-σῐς	"suffix forming nouns"
3	Ancient Greek	-τις	retained after dentals
4	Proto-Indo-European	-tis	Derives abstract/action nouns from verb roots

Words derived from “apsida”

apside
anapside

Every word from Proto-Indo-European -tis →Every word from Ancient Greek -σῐς →Every word from Ancient Greek ἁψίς →