Thoracostei
plural noun
Tho·ra·cos·tei
ˌthōrəˈkästēˌī,
ˌthȯr-
in some classifications
: an order comprising fishes with the body more or less completely covered by bony plates and the pharyngeal bones and other structures about the head more or less undeveloped and including the sticklebacks, pipefishes, and sea horses
Word History
Etymology
New Latin, from thorac- + -ostei (from Greek osteon bone)