Entry 1 sense Webster, 1913 Radio-flagellata /(rā`dĭ*ō̇*flăj`ĕl*lā"tȧ)/ · Ra·di·o-flag·el·la·ta · IPA 01 n. pl. A group of Protozoa having both flagella and pseudopodia. 1. A group of Protozoa having both flagella and pseudopodia.(Zool.)