phycologyPronunciation: /fʌɪˈkɒlədʒi/Definition of phycology noun [mass noun] the branch of botany concerned with seaweeds and other algae. Derivatives phycologicalPronunciation: /-kəˈlɒdʒɪk(ə)l/ adjective phycologist noun phycology in other Oxford dictionaries Definition of phycology in the US English dictionary