Source : Webster's Revised Unabridged Dictionary (1913)

Ostracodermi \Os`tra*coder"mi\, n. pl. [NL., fr. Gr. ? shell of
   a testacean + ? skin.] (Zo["o]l.)
   A suborder of fishes of which Ostracion is the type.

Source : WordNet®

Ostracodermi
     n : extinct group of armored jawless vertebrates; taxonomy is
         not clear [syn: {order Ostracodermi}]