ὁρίζων
From LSJ
κάλλιστον ἐφόδιον τῷ γήρᾳ ἡ παιδεία (Aristotle, quoted by Diogenes Laertius 5.21) → the finest provision for old age is education
English (LSJ)
(sc. κύκλος), οντος, ὁ,
A separating circle (cf. ὁρίζω 1.1b), horizon, Autol.Sph.5, Ti.Locr.97a ; ὁτοῦ ὁρίζοντος κύκλος Arist.Mete. 363a27 ; ὁ ὁ. κύκλος Id.Cael.297b34, al. ; ὁ αἰσθητὸς ὁ., opp. ὁ λόγῳ θεωρητός, Gem.5.56,57 ; οἱ ὁρίζοντες Ti.Locr.97d. 2 Pythag. name for 9, because it limits, i.e. finishes, the series of units, Theol.Ar.57.
German (Pape)
[Seite 378] οντος, ὁ, der Abgränzende, der Horizont, Tim. Locr. 97 a u. öfter bei Sp., die zum Theil κύκλος, auch ἀήρ ergänzen.