Here's what rhymes with icthyological.
logical illogical biological psychological theological analogical zoological dialogical ethnological hydrological aetiological ethological urological horological ideological ecological pathological geological ontological histological phonological etiological philological typological serological tautological audiological physiological archaeological sociological chronological morphological neurological genealogical mythological astrological topological archeological gynaecological speleological technological methodological eschatological pedagogical radiological teleological microbiological mineralogical terminological embryological gynecological hematological toxicological dermatological haematological ornithological musicological immunological meteorological pharmacological phenomenological bacteriological psychophysiological neuropsychological biotechnological epidemiological neurophysiological electrophysiological Words that almost rhyme with icthyological
tropical prodigal periodical subtropical nontropical semitropical astronautical microscopical conical chronicle comical ironical rhetorical dropsical historical hospital diabolical symbolical theosophical philosophical economical astronomical categorical ahistorical gastronomical pocketsful paradoxical metaphorical unhistorical taxonomical uneconomical prehistorical