τριταῖος

α, ον, ὁ
A. on the third day, used with Verbs so as to agree with the subject, τριταῖοι ἐγένοντο ἐν τῇ Ἀττικῇ Hdt. 6.120, cf. Hp. Aph. 4.36, Th. 1.61, 3.3, etc.; τ. ἄνεμος which will blow in three days, Pi. N. 7.17; τριταίαν καρύσσουσιν θυσίαν E. El. 171 (lyr.); τ. ἐκφορά a funeral three days after death, Pl. Lg. 959a; ἐσβεβληκὼς . . τ. ἐς Μηλιέας three days before, Hdt. 7.196, cf. Plb. 15.33.11.
II. three days old, ἰχθύδια τ. Ar. Fr. 387.9; ᾠὰ τ. ὄντα Arist. PA 665a35; φίλος τ. of three days' standing, Theoc. 29.18; ἐπεὰν τ. γένωνται after being three days dead, Hdt. 2.89.
2. τριταῖος (sc. πυρετός), ὁ, tertian fever or ague, Hp. Aph. 3.21, Nat.Hom. 15, Pl. Ti. 86a; ὁ ἀκριβὴς τ. Gal. 18(2).246; οἱ τ. πυρετοί Id. 15.755; τ. ῥῖγος POxy. 1151.37 (v A. D.).
III. of days, third, τ. φέγγος, ἡμέρα, E. Hec. 32, Hipp. 275; ἐς τὴν τριταίην Hp. Coac. 225.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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