Etymology
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iron-gray (adj.)

Middle English, from Old English isengræg; see iron (n.) + gray (adj.). The color of freshly broken cast iron.

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Definitions of iron-gray
1
iron-gray (n.)
the color of freshly broken cast iron;
Synonyms: iron-grey
2
iron-gray (adj.)
of the grey color of iron;
Synonyms: iron-grey
From wordnet.princeton.edu