The Collaborative International Dictionary of English v.0.48:

Radio-flagellata \Ra`di*o-flag`el*la"ta\
   (r[=a]`d[i^]*[-o]*fl[a^]j`[e^]l*l[=a]"t[.a]), n. pl. [NL. See
   Radiate, and Flagellata.] (Zool.)
   A group of Protozoa having both flagella and pseudopodia.
   [1913 Webster]