Correct spelling for the English word "Decomposite" is [dˌiːkəmpˈɒsɪt], [dˌiːkəmpˈɒsɪt], [d_ˌiː_k_ə_m_p_ˈɒ_s_ɪ_t] (IPA phonetic alphabet).
• Anything decompounded.
• Compounded a second time; having a compound base or radical.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.