Correct spelling for the English word "frightihead" is [fɹˈa͡ɪtihˌɛd], [fɹˈaɪtihˌɛd], [f_ɹ_ˈaɪ_t_i_h_ˌɛ_d] (IPA phonetic alphabet).
I apologize, but "frightihead" does not exist as a recognized English word. It is possible that it might be a slang term or a typo. Therefore, there is no dictionary definition available for "frightihead." If you have any other word or term you would like a definition for, I would be more than happy to assist you.