μήστωρ · mēstōr — LSJ
adviser, counsellor, authors
adviser, counsellor, ὕπατος μήστωρ, of Zeus, Il. 8.22, 17.339; θεόφιν μήστωρ ἀτάλαντος, of Priam, 7.366; Patroclus, 17.477, Od. 3.110; Neleus, 3.409; Ἀθηναῖοι μήστωρες ἀϋτῆς authors of the battle-din, Il. 4.328; μήστωρα φόβοιο, of Diomedes, 6.278; of Patroclus, 23.16; μήστωρε φ., of the horses of Aeneas, 5.272, 8.108.
2 skilled assistant
in Ion. Prose, skilled assistant to a surgeon, Hp. Mochl. 38.
II
as Adj., μήστορι σιδάρῳ Tim. Pers. 143.