ιχνευτήρ

From LSJ

τούτου δὲ συμβαίνοντος ἀναγκαῖον γίγνεσθαι πάροδον καὶ τροπὰς τῶν ἐνδεδεμένων ἄστρων → but if this were so, there would have to be passings and turnings of the fixed stars

Source

Greek Monolingual

ἰχνευτήρ, ὁ, θηλ. ἰχνεύτειρα (Α)
ἰχνευτής.
[ΕΤΥΜΟΛ. Παράλλ. τ. του ἰχνευτής < ἰχνεύω.