pteridologyPronunciation: /ˌtɛrɪˈdɒlədʒi/Definition of pteridology noun [mass noun] the study of ferns and related plants. Derivatives pteridologicalPronunciation: /-dəˈlɒdʒɪk(ə)l/ adjective pteridologist noun Origin: mid 19th century: from Greek pteris, pterid- 'fern' + -logypteridology in other Oxford dictionaries Definition of pteridology in the US English dictionary