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[Gr.,=hidden writing], science of secret writing. There are many devices by which a message can be concealed from the casual reader, e.g., invisible writing, but the term cryptography strictly applies to translating messages into cipher or code.
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A transposition or substitution code for transmitting secret messages.
1. an obsolete name for zero
2. any of the Arabic numerals (0, 1, 2, 3, etc., to 9) or the Arabic system of numbering as a whole
3. Music a defect in an organ resulting in the continuous sounding of a pipe, the key of which has not been depressed