Noun: pelycosaur 'pe-li-ku,sor
- Large primitive synapsid reptile, often with a tall spinal sail; lived during the Permian period
"Pelycosaurs like Dimetrodon are often mistaken for dinosaurs"
Derived forms: pelycosaurs
Type of: synapsid, synapsid reptile
Part of: order Pelycosauria, Pelycosauria
Encyclopedia: Pelycosaur