bryologyPronunciation: /brʌɪˈɒlədʒi/Definition of bryology noun [mass noun] the study of mosses and liverworts. Derivatives bryologicalPronunciation: /-əˈlɒdʒɪk(ə)l/ adjective bryologist noun Origin: mid 19th century: from Greek bruon 'moss' + -logybryology in other Oxford dictionaries Definition of bryology in the US English dictionary