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fortification agate

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noun
  1. an agate, used as a gem, having polygonal banding such that it suggests the plan of a bastion.
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Origin of fortification agate

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for fortification agate

Historical Examples

  • Sometimes they are arranged in angles, presenting the fortification-agate.

    Scenes and Adventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas

    Henry Rowe Schoolcraft