(noun) fast -running African flightless bird with two-toed feet; largest living bird
(noun) a person who refuses to face reality or recognize the truth (a reference to the popular notion that the ostrich hides from danger by burying its head in the sand)
(noun) animal reproductive body consisting of an ovum or embryo together with nutritive and protective envelopes; especially the thin-shelled reproductive body laid by e.g. female birds
(noun) oval reproductive body of a fowl (especially a hen) used as food