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cryptonym

[krip-tuh-nim]
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noun
  1. a secret name or word; a code name or code word.
Related formscryp·ton·y·mous [krip-ton-uh-muh s] /krɪpˈtɒn ə məs/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018