Abbott-Smith Manual Greek Lexicon
βάσανος (G931)
3 βάσανος , -ου, ὁ (of Oriental origin), [in LXX chiefly for כְּלִמָּה ,אָשָׁם , and freq. in IV Mac ;] prop., touchstone , a dark stone used in testing metals. examination by torture . torment , torture : Mt 4:24 , Lk 15:23 , 28 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain