1) Bird genus 2) Flightless bird 3) Genus struthio 
Struthio is a genus of bird in the order Struthioniformes. There are ten known species from this genus, of which eight are extinct. There are five more possible species of which trace fossils have been found. They are: Fossil records and egg shell fragments show that the ancestors of this genus originated about 40-58 million years ago (mya) in the...
• (n.) A genus of birds including the African ostriches.
Stru'thi·o noun ; plural Struthiones . [ Latin , an ostrich, from Greek ....] (Zoology) A genus of birds including the African ostriches. 
[n] - type genus of the Struthionidae: African ostriches
genus Struthio noun type genus of the Struthionidae: African ostriches