dodecaphonic
adjective
do·deca·phon·ic (ˌ)dō-ˌde-kə-ˈfä-nik 
: twelve-tone
dodecaphonically
(ˌ)dō-ˌde-kə-ˈfä-ni-k(ə-)lē
adverb dodecaphonist
dō-ˈde-kə-fə-nist
noun -ˌfō-;
ˌdō-di-ˈka-fə-nist
dodecaphony
dō-ˈde-kə-fə-nē
noun -ˌfō-;
ˌdō-di-ˈka-fə-nē
Word History
Etymology
dodeca- + phon- + -ic
First Known Use
1949, in the meaning defined above