Correct spelling for the English word "Thermotical" is [θɜːmˈɒtɪkə͡l], [θɜːmˈɒtɪkəl], [θ_ɜː_m_ˈɒ_t_ɪ_k_əl] (IPA phonetic alphabet).
Produced by heat.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.