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1. Oxford American Dictionary

   placoderm

   • IPA[ˈplakəˌdərm]

   美式

   • n.
     an extinct fish of the Devonian period, having the front part of the body encased in broad flat bony plates.

   • noun: placoderm, plural noun: placoderms

2. • 更多解釋

   placoderm

   • IPA[ˈplakə(ʊ)dəːm]

   英式

   • n.
     a fossil fish of the Devonian period, having the front part of the body encased in broad flat ...

   Oxford Dictionary