RhodophytaPronunciation: /ˌrəʊdə(ʊ)ˈfʌɪtə/Definition of Rhodophyta noun Botany a division of lower plants that comprises the red algae. Origin:modern Latin (plural), from rhodo- 'rose-coloured' + Greek phuta 'plants'Rhodophyta in other Oxford dictionaries Definition of Rhodophyta in the US English dictionary