- a large, two-toed, swift-footed flightless bird, Struthio camelus, indigenous to Africa and Arabia, domesticated for its plumage: the largest of living birds.
- (not used scientifically) a rhea.
- a person who attempts to ignore unpleasant facts or situations.
- a fast-running flightless African bird, Struthio camelus, that is the largest living bird, with stout two-toed feet and dark feathers, except on the naked head, neck, and legs: order Struthioniformes
- American ostrich another name for rhea
- a person who refuses to recognize the truth, reality, etc: a reference to the ostrich's supposed habit of burying its head in the sand
