pteridosperm

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Related to Pteridospermatophyta: Pteridospermophyta, Seed ferns

pteridosperm

(ˈtɛrɪdəˌspɜːm)
n
1. (Plants) any extinct seed-producing fernlike plant of the group Pteridospermae. Also called: seed fern
2. (Palaeontology) any extinct seed-producing fernlike plant of the group Pteridospermae. Also called: seed fern
[C19: from Greek pteris a fern + -sperm]

seed′ fern`


n.
any of various fossil plants of the order Lyginopteridales (or Cycadofilicales) that had fernlike leaves and reproduced by means of seeds. Also called pteridosperm.
[1925–30]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pteridosperm - an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)pteridosperm - an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)
gymnosperm - plants of the class Gymnospermae having seeds not enclosed in an ovary
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