ἔλλειψις · elleipsis — LSJ
falling short, defect
falling short, defect, opp. ὑπερβολή, Democr. 102, Pl. Prt. 356a; opp. ὑπεροχή, Arist. Ph. 187a17, Metaph. 1042b25; ὑπερβολὴ καὶ ἔ. καὶ τὸ μέσον Id. EN 1106b17.
2 the conic section ellipse, falling short
the conic section ellipse, Apollon.Perg. Con. 1.13 (so called because the square on the ordinate is equal to a rectangle with height equal to the abscissa and applied to the parameter, but falling short of it).
3 deficiency
ἐν ἐλλείψεσιν ἐνυπάρχειν to be present in deficiency, of the negative terms in an algebraical expression, Dioph. 1Praef. p.14 T.
4 ellipse, omission
Gramm., ellipse, Ath. 14.644a, A.D. Synt. 117.19; omission of a letter, Id. Pron. 56.28.
5
= ἔκλειψις, Olymp. in Mete. 67.37 (s.v.l.).
6 two
Pythag.name for two, Theol.Ar. 10.