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

Origin of dodeca-

< Greek dōdeka-, combining form of dōdekás twelve, equivalent to dō- two + -dekas ten Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for dodeca-


n combining form

indicating twelvedodecagon; dodecahedron; dodecaphonic

Word Origin for dodeca-

from Greek dōdeka twelve
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012