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1. Oxford American Dictionary

   pteridosperm

   • IPA[təˈridəˌspərm]

   美式

   • n.
     an extinct plant that is intermediate between the ferns and seed-bearing plants, dying out in the Triassic period.

   • noun: pteridosperm, plural noun: pteridosperms

2. • 更多解釋

   pteridosperm

   • IPA[tɪˈrɪdəspəːm]

   英式

   • n.
     a fossil plant which is intermediate between the ferns and seed-bearing plants, dying out in ...

   Oxford Dictionary