Noun order ostracodermi has 1 sense
  1. Ostracodermi, order Ostracodermi - extinct group of armored jawless vertebrates; taxonomy is not clear
    --1 is a kind of animal order
    --1 is a member of Agnatha, superclass Agnatha
    --1 has members:
     ostracoderm; Heterostraci, suborder Heterostraci; Osteostraci, suborder Osteostraci, Cephalaspida, suborder Cephalaspida
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