καλοδιδάσκαλοςkalodidáskalos, kal-od-id-as'-kal-os; from G2570 and G1320; a teacher of the right:—teacher of good things.
Thayer's Greek Lexicon
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STRONGS G2567:
καλοδιδάσκαλος, καλοδιδασκαλου, ὁ, ἡ (διδάσκαλος and καλόν, cf. ἱεροδιδασκαλος, νομοδιδάσκαλος, χοροδιδάσκαλος), teaching that which is good, a teacher of goodness: Titus 2:3. Nowhere else.