Etymology
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Words related 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 kráuti "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.

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cryptarchy (n.)

"secret government," 1798; see crypto- + -archy.

cryptogram (n.)

"a message or writing in secret characters or code," 1849, from crypto- "secret, hidden" + gram "word, letter." A modern word coined in English; though the elements are Greek, the ancient Greeks would find the construction barbarous. Cryptograph in the same sense was used from 1849.

cryptograph (n.)

1849, "something written in secret characters;" see crypto- "secret, hidden" + -graph "writing, something written." From 1879 as "system of secret writing."

cryptology (n.)

1640s, "secret or occult language," from crypto- "secret, hidden" + -ology. From 1945 as "science of secret characters or codes."

cryptonym (n.)

"private, secret, or hidden name," 1868 (by 1855 in German); from crypto- "secret, hidden" + -onym "name," from Greek (from PIE root *no-men-"name").

encrypt (v.)
1968 in telecommunications, a back-formation from encryption (1964), or from en- (1) + crypt (n.) on the notion of "hidden place" (see crypto-). Related: Encrypted; encrypting.