'Cryptogram' definitions:

Definition of 'cryptogram'

(from WordNet)
noun
A piece of writing in code or cipher [syn: cryptogram, cryptograph, secret writing]

Definition of 'Cryptogram'

From: GCIDE
  • Cryptogram \Cryp"to*gram\ (kr?p"t?-gr?m), n. A cipher writing. Same as Cryptograph. [1913 Webster]