banksia Syllabification: (bank·si·a)Pronunciation: /ˈbaNGksēə/Definition of banksia noun an evergreen Australian shrub that typically has narrow, leathery leaves and spikes of bottlebrushlike flowers. Genus Banksia, family Proteaceae Origin:modern Latin, named after Sir Joseph Banks (see Banks, Sir Joseph)banksia in other Oxford dictionaries Definition of banksia in the British & World English dictionary