1. Presumably in the common ancestral line to dinosaurs and crocodiles and birds
   - thecodont

Derived forms: thecodont reptiles

Type of: archosaur, archosaurian, archosaurian reptile

Part of: order Thecodontia, Thecodontia

• backpedal
• backplate
• backrest
• backroom
• backroom boy
• backsaw
• backscatter
• backscratcher
• backseat
• backseat driver
• backsheesh
• backside
• backslap
• backslapper
• backslash
• backslide
• backslider
• backsliding
• backspace
• backspace character
• backspace key
• backspacer
• backspin
• backstabber
• backstage