Pronunciation: [lɑːɹˈɪθmɪks] (IPA)
Correct spelling for the English word "larithmics" is [lɑːɹˈɪθmɪks], [lɑːɹˈɪθmɪks], [l_ɑː_ɹ_ˈɪ_θ_m_ɪ_k_s] (IPA phonetic alphabet).