ὀπωρ-ινός · opōr-inos — LSJ
of ὀπώρα, late summer
of ὀπώρα or late summer, ἀστέρʼ ὀπωρινῷ ἐναλίγκιον, i. e. Sirius, the star whose rising marked the beginning of that season (v. ὀπώρα), Il. 5.5 ; ἦμαρ 16.385 ; βορέης 21.346, Od. 5.328; ὄμβρος Hes. Op. 674, 677 ; ὄρχατοι E. Fr. 896 ; δέλφαξ Ar. Fr. 506.4 ; πυλαία SIG 239C 31, al. (Delph., iv B. C.). [In Hom. the last syll. is always long (by position in Il. 21.346), and the penult. is long also, metri gr.: when the ult. is short, the penult. also is short, as in Hes. Op. 674 ; in Att. ῐ always ;