1. Widespread group including duck-billed dinosaurs and their early relatives (hadrosaurs, trachodon and iguanodon)
   - Euronithopoda, suborder Euronithopoda, Ornithopoda, suborder Ornithopoda

Derived forms: euronithopods

Type of: animal order

Part of: order Ornithischia, Ornithischia

• appellee
• append
• appendage
• appendaged
• appendant
• appendectomy
• appendicectomy
• appendicitis
• appendicle
• appendicular
• appendicular artery
• appendicular skeleton
• appendicular vein
• appendicularia
• appendix
• Appenzeller
• apperceive
• apperception
• apperceptive
• appertain
• appetence
• appetency
• appetent
• appetiser
• appetising