| cacodemon | (noun) an evil spirit | Synonyms: cacodaemon |
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| cacodemonic | (adjective) of or relating to evil spirits | Synonyms: cacodaemonic |
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| code | (noun) a coding system used for transmitting messages requiring brevity or secrecy | - |
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| (noun) a set of rules or principles or laws (especially written ones) | Synonyms: codification |
| (noun) (computer science) the symbolic arrangement of data or instructions in a computer program or the set of such instructions | Synonyms: computer code |
| (noun) a series of letters, numbers or symbols assigned to something for the purpose of classification or identification | - |
| (verb) convert ordinary language into code | Synonyms: cipher, cypher, encipher, encrypt, inscribe, write in code |
| (verb) attach a code to | - |
| codefendant | (noun) a defendant who has been joined together with one or more other defendants in a single action | Synonyms: co-defendant |
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| codeine | (noun) derivative of opium; used as an antitussive (to relieve coughing) and an analgesic (to relieve pain) | - |
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| coder | (noun) a person who designs and writes and tests computer programs | Synonyms: computer programmer, programmer, software engineer |
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| codetalker | (noun) a secret agent who was one of the Navajos who devised and used a code based on their native language; the code was unbroken by the Japanese during World War II | Synonyms: windtalker |
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| codex | (noun) an unbound manuscript of some ancient classic (as distinguished from a scroll) | Synonyms: leaf-book |
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| (noun) an official list of chemicals or medicines etc. | - |
| decode | (verb) convert code into ordinary language | Synonyms: decipher, decrypt |
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| decoder | (noun) a machine that converts a coded text into ordinary language | - |
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| (noun) the kind of intellectual who converts messages from a code to plain text | Synonyms: decipherer |
| encode | (verb) convert information into code | - |
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| microcode | (noun) (computer science) coded instructions that are stored permanently in read-only memory | Synonyms: firmware |
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| ostracoderm | (noun) extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic | - |
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| placoderm | (noun) fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws | - |
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| postcode | (noun) a code of letters and digits added to a postal address to aid in the sorting of mail | Synonyms: postal code, ZIP, ZIP code |
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| recode | (verb) put into a different code; rearrange mentally | - |
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