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American Tract Society Bible Dictionary
A name anciently used for the diamond, the hardest of all minerals. It is used for cutting or writing upon glass and other hard substances, Jeremiah 17:1 . It is also employed figuratively, Ezekiel 3:9; Zechariah 7:12 . Others supposed the smiris, or emery, to be meant.
These files are public domain and are a derivative of the topics are from American Tract Society Bible Dictionary published in 1859.
Rand, W. W. Entry for 'Adamant'. American Tract Society Bible Dictionary. https://www.studylight.org/dictionaries/eng/ats/a/adamant.html. 1859.