Definition of Holostei
in many classifications
: an order of ganoid fishes having a well-developed bony skeleton and approaching teleosts in structure now usually restricted to the gars (family Lepisosteidae) and various extinct genera (such as Lepidotes and Semionotus) but sometimes extended to include the bowfin and related fishes or made a superorder including the teleosts — compare cycloganoidei , ginglymodi
