βασανιστής, βασανιστου, ὁ (βασανίζω), one who elicits the truth by the use of the rack, an inquisitor, torturer, ((Antiphon, others); Demosthenes, p. 978, 11; Philo in Flacc. § 11 end; (de concupisc. § 1; quod omn. prob. book 16; Plutarch, an vitios. ad infel. suff. § 2)); used in Matthew 18:34 of a jailer (δεσμοφύλαξActs 16:23), doubtless because the business of torturing was also assigned to him.
Matthew 18:34 - N-DMP GRK:αὐτὸν τοῖς βασανισταῖς ἕως οὗ NAS: handed him over to the torturers until KJV: him to the tormentors, till INT: him to the jailers until that