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https://duckduckgo.com/?q=crypto+definition

crypto /krip'to/
noun
1. One who covertly supports a certain doctrine, group, or party.
2. Cryptography.
3. A secret supporter or follower.
adjective
1. Secret or covert.
The American Heritage(r) Dictionary of the English Language, 5th
Edition * More at Wordnik https://www.wordnik.com/words/crypto

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see also:
https://duckduckgo.com/?q=crypto+etymology

...
https://www.etymonline.com/word/crypto-
crypto-
before vowels crypt-, word-forming element meaning "secret" or "hidden,
not evident or obvious," used in forming English words at least since
1760 (crypto-Calvinianism), from Latinized form of Greek kryptos
"hidden, concealed, secret" (see crypt; the Greek combining form was >krypho-).
In 19c. often of secret religious faith; from 1870s in scientific
words; since c. 1945 typically of hidden political loyalties. Crypto-
fascist is attested from 1937; crypto-communist from 1946. Hence, as
an abstracted noun, crypto "person who conceals a political adherence" >(1946).
also from 1760
Entries linking to crypto-
crypt (n.)
early 15c., cripte, "grotto, cavern," from Latin crypta "vault,
cavern," from Greek krypte "a vault, crypt" (short for krypte kamara
"hidden vault"), fem. of kryptos "hidden," verbal adjective from
kryptein "to hide," which is of uncertain origin. Comparison has been
made to Old Church Slavonic kryjo, kryti "to hide," Lithuanian krauti
"to pile up." Beekes writes that krypto "is formally and semantically >reminiscent of [kalypto]; the verbs may have influenced each other."
For this, see calypto-. But he adds, "However, since there is no good
IE etymology, the word could be Pre-Greek." Meaning "underground
burial vault or chapel in a church" is attested by 1789.
cryptarchy (n.)
"secret government," 1798; see crypto- + -archy.

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(ergo all cryptos are communists hidden in burial vaults and churches)

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