1. Large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America

Derived forms: pelycosaurs

Type of: synapsid, synapsid reptile

Part of: order Pelycosauria, Pelycosauria

Encyclopedia: Pelycosaur

• polyphagous
• polyphagy
• polypharmacy
• polyphase
• Polyphemus
• polyphemus moth
• polyphone
• polyphonic
• polyphonic letter
• polyphonic music
• polyphonic prose
• polyphonically
• polyphonous
• polyphony
• polyphosphate
• polyphosphoric acid
• polyphyletic
• Polyplacophora
• polyplacophore
• polyploid
• polyploidy
• Polypodiaceae
• Polypodiales
• Polypodium
• Polypodium aureum