StruthionesStru`thi*o"nes\, n. pl. [NL. See Struthio.] (Zo["o]l.) (a) A division, or order, of birds, including only the African ostriches. (b) In a wider sense, an extensive group of birds including the ostriches, cassowaries, emus, moas, and allied birds incapable of flight. In this sense it is equivalent to Ratit[ae], or Drom[ae]ognath[ae].