pteridosperm

pteridosperm

(ˈtɛrɪdəˌspɜːm) n1. (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]

Thesaurus

Noun

1.

pteridosperm - an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)seed ferngymnosperm - plants of the class Gymnospermae having seeds not enclosed in an ovary