apparently passive participle of H5172 (perhaps in the sense of ringing), i.e. bell-metal; or from the red color of the throat of a serpent (H5175, as denominative) when hissing); coppery, i.e. (figuratively) hard; of brass.
Usages throughout the bible
Job 6:12
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Is my strength the strength of stones? or is my flesh of brass? H5153