‖Stru′thi‐o″nes (?), n. pl. [NL. See Struthio.] (Zoöl.) (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 Ratitæ, or Dromæognathæ.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.