a combining form meaning “twelve,” used in the formation of compound words: dodecasyllabic.
Also, especially before a vowel, dodec-.

< Greek dōdeka-, combining form of dōdekás twelve, equivalent to dō- two + -dekas ten Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
n combining form
indicating twelve: dodecagon; dodecahedron; dodecaphonic
[from Greek dōdeka twelve]

Collins English Dictionary - Complete & Unabridged 10th Edition
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