noun
extinct gymnosperms most of Carboniferous to Jurassic: seed ferns and allies
• Syn: ↑Pteridospermopsida
• Hypernyms: ↑class
• Member Holonyms: ↑Gymnospermae, ↑class Gymnospermae, ↑Gymnospermophyta, ↑division Gymnospermophyta
• Member Meronyms: ↑Cycadofilicales, ↑order Cycadofilicales, ↑Lyginopteridales, ↑order Lyginopteridales
Useful english dictionary. 2012.