ˌästēˈikthēˌēz noun plural
Usage: capitalized
Etymology: New Latin, from oste- + Greek ichthyes, pl of ichthys fish — more at ichthus
in some classifications : a class or other category of fishes including the lungfishes, crossopterygians, teleosts, and especially formerly the arthrodires and ostracoderms and distinguished from other forms resembling fish by the presence of true bone in their skeleton — compare chondrichthyes