Share this entry
pteridosperm Syllabification: pte·rid·o·sperm
Pronunciation: /təˈridəˌspərm/ /ˈteridə-/

Definition of pteridosperm in English:


An extinct plant that is intermediate between the ferns and seed-bearing plants, dying out in the Triassic period. Also called seed fern.
  • Formerly placed in their own taxon (class Pteridospermeae), but now included with the gymnosperms
Example sentences
  • The idea that cycads stem from Carboniferous so-called pteridosperms (‘seed ferns’ or seed plants with fern-like foliage) has long been popular with paleobotanists.
  • The Pteridopsida were present, bearing spores on their leaves as they do today, but there were also fernlike seed-bearing ferns, the pteridosperms.
  • The first seeds evolved in a group of vascular plants sometimes called the pteridosperms, or ‘seed ferns.’


Early 20th century: from modern Latin pteridospermeae, from Greek pteris, pterid- 'fern'.

Definition of pteridosperm in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove ads and access premium resources