Dictionary entry

τρεῖς

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament with Strong's

τρεῖς, οἱ, αἱ, τρία, τά

three: Mt 12:40, al.; μετὰ τ. ἡμέρας = τῇ τρίτῃ ἡ., Mk 10:34, al. (cf. Field, Notes, 11 ff.)