Definitions

1. adjective

belonging or relating to the Teleostei, the most advanced group of bony fishes, characterized by modern-style skeletons and jaws.

“The teleostean fish in the aquarium was an impressive specimen.”

2. noun

A member of the Teleostei, a group of fish characterized by advanced skeletons and jaws.

“The teleostean species found in the river were studied by the scientists.”