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iron gray
iron hand
iron horse
iron law of wages
iron lung
iron maiden
iron out
iron oxide
iron pan
iron pyrites
iron ration
iron triangle
iron-willed
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iron pan

i·ron pan (plural i·ron pans)


noun 
Definition:
 
hard layer in sand or gravel: a hard layer below the surface of sand or gravel in which iron salts from percolating water have precipitated, cementing the grains of the material together

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