Class Osteichthyes is a classification of bony fish that includes over 30,000 species. This classification is derived from the Greek words osteon, meaning bone, and ichthys, meaning fish. Common synonyms for Class Osteichthyes include the phrase "bony fish", as well as the terms Osteichthyes and Osteichthyans. Both of these terms are derived from the scientific name for the class. Other synonyms include the terms teleosts, ray-finned fish, and spiny-finned fish. These terms all describe specific types of fish within the Osteichthyes classification. Ray-finned fish, for example, have fins that are supported by bony rays, while spiny-finned fish have fins with sharp spines.