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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Formed in a blackboard bold typeface, in which certain lines of the character are doubled

from The Century Dictionary and Cyclopedia

  • In numismatics, showing a double impression of the device (type) or inscription, as a coin or medal, owing to the fact that the metal blank accidentally shifted while the specimen was being struck off from the die.


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