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secret language
THESAURUS
secret language
Aesopian language, Babel, Greek, argot, babble, cant, cipher, code, coded message, cryptoanalysis, cryptoanalytics, cryptogram, cryptograph, cryptographer, cryptography, double Dutch, garble, gibberish, gift of tongues, glossolalia, gobbledygook, invisible ink, jargon, jumble, noise, scramble, secret writing, slang, sympathetic inkFor further exploring for "secret language" in Webster Dictionary Online