cryptolect
n. A secret language.

Example Citations:
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, June 7, 1994

Historically, cryptolects have been especially prevalent among service nomads: outsiders who provide settled populations with services they lack but are nonetheless met with hostility and mistrust, such as Gypsy coppersmiths, Irish Travelers, or the Sheikh Mohammadi peddlers of Afghanistan.
—Jacob Mikanowski, “The Tongues of Rogues,” Slate, December 5, 2013

Earliest Citation:
In the cryptolect of Yiddish-speaking thieves, a word for ‘prison’ is kan.
—David L. Gold, “Etymological Studies of Jewish Interest, Part 1,” Comments on Etymology Vol.XII, No. 5-6, May 1, 1982

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