Originally denoting the bronze corslet of Greek warriors, this noun describes armor protecting the chest and torso. Paul employs it metaphorically twice: the 'breastplate of righteousness' in the spiritual armor passage (Eph 6:14) and the 'breastplate of faith and love' (1 Thess 5:8). In Revelation's apocalyptic visions, demonic locusts wear breastplates like iron (Rev 9:9), and the cavalry from the Euphrates bear breastplates of fiery red, blue, and sulfurous yellow (Rev 9:17). Spanish 'coraza,' French and German 'Brustpanzer' all preserve the concrete military imagery.