a combining form meaning “hidden,” “secret,” used in the formation of compound words: cryptograph.
Also, especially before a vowel, crypt-.

combining form representing Greek kryptós hidden. See crypt Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
crypto- or (before a vowel) crypt-
combining form
secret, hidden, or concealed: cryptography; crypto-fascist
[New Latin, from Greek kruptos hidden, from kruptein to hide]
crypt- or (before a vowel) crypt-
combining form
[New Latin, from Greek kruptos hidden, from kruptein to hide]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

combining element meaning "secret" or "hidden," used in forming English words since at least 1760, from Gk. kryptos "hidden, concealed, secret" (the Gk. comb. form was krypho-). Crypto-fascist is attested from 1937; crypto-communist from 1946.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

crypto- or crypt-

  1. Crypt: cryptectomy.

  2. Hidden; secret: cryptogenic.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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