PhaeophyceaePronunciation: /ˌfʌɪə(ʊ)ˈfʌɪsiː/Definition of Phaeophyceae noun Botany a class of lower plants that comprises the brown algae. Class Phaeophyceae, division Heterokontophyta (or phylum Heterokonta, kingdom Protista); formerly division Phaeophyta Origin:modern Latin (plural), from Greek phaios 'dusky' + phukos 'seaweed'Phaeophyceae in other Oxford dictionaries Definition of Phaeophyceae in the US English dictionary
