Dungeon
Different from the ordinary prison in being more severe as a place of punishment. Like the Roman inner prison (Acts 16:24), it consisted of a deep cell or cistern (Jer 38:6). To be shut up in, a punishment common in Egypt (Gen 39:20; Gen 40:3; Gen 41:10; Gen 42:19). It is not mentioned, however, in the law of Moses as a mode of punishment. Under the later kings imprisonment was frequently used as a punishment (2 Chr 16:10; Jer 20:2; Jer 32:2; Jer 33:1; Jer 37:15), and it was customary after the Exile (Matt 11:2; Luke 3:20; Acts 5:18, Acts 5:21; Matt 18:30).
From Easton’s Bible Dictionary (1897), by Matthew George Easton.