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  1. 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

    • 更多解釋
    • IPA[ˈtɛrɪdəʊspəːm]

    英式

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

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