Where does “Synapsida” come from?

Synapsida (Translingual) 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.

Ancestry of “Synapsida”, 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	Earlier form of -σις , retained after dentals δ,...
4	Proto-Indo-European	-tis	Derives abstract/action nouns from verb roots

Words derived from “Synapsida”

synapsid
Synapsidomorpha

Every word from Proto-Indo-European -tis →