Where does “ellipses” come from?

Ellipses comes from French ellipse, from Ancient Greek ἔλλειψις, derived from the Ancient Greek suffix -σις forming abstract nouns from verb roots.

ellipses (English): plural of ellipse; plural of ellipsis

Definitions

Step	Language	Word	Meaning
1	English	ellipse	A closed curve, the locus of a point such that...
2	French	ellipse	ellipse; ellipsis
3	Latin	ellīpsis	—
4	Ancient Greek	ἔλλειψις	A falling short, defect; The conic section: an...
5	Ancient Greek	ἐλλείπω	to fall short, omit; I fall short, leave out; I...
6	Ancient Greek	ἐν-	in, within; on
7	Ancient Greek	ἐν	in, on, at; among; in, at, or during the time of
8	Ancient Greek	δέρμα	skin, hide
9	Ancient Greek	γλυφή	carving, carved work; hole cut
10	Ancient Greek	-ῐ́ᾱ	{{l\|en\|-ia}}; "suffix forming abstract feminine...
11	Proto-Indo-European	-íh₂	—
12	Proto-Indo-European	-h₂	Creates collective nouns, which refer to groups...