1. Used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales
   - group Pteridospermae, Pteridospermaphyta, group Pteridospermaphyta

Type of: taxon, taxonomic category, taxonomic group

Encyclopedia: Pteridospermae

• Machilidae
• machinate
• machination
• machinator
• machine
• machine bolt
• machine code
• machine gun
• machine gunner
• machine language
• machine operation
• machine pistol
• machine politician
• machine readable
• machine readable dictionary
• machine rifle
• machine screw
• machine shop
• machine stitch
• machine tool
• machine translation
• machine-accessible
• machine-controlled
• machine-displayable text
• machine-driven