Posted in Web Ostrich – definition of ostrich by The Free Dictionary May 16, 2019 1. (Animals) 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. : https://www.thefreedictionary.com/ostrich