cryptolect
n. A secret language.

Example Citation:
"Unlike modern slang the ancient cant approaches the notion of a...'cryptolect,' as described by Ian Hancock. Altered by time, it retains a degree of currency in the British Isles and North America among Travelers, a traditionally itinerant people including the Roma (Gypsies) and other groups."
—J. E. Lighter, Random House Historical Dictionary of American Slang, Volume I

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