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.
Although written in 1859 by William Rand, this dictionary of the Bible from the American Tract Society is still relevant today.Wikipedia
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