\Stru`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]}.