1. Not corresponding in structure or evolutionary origin
   - heterologous, heterological

See also: heterology

• pyloric vein
• pylorus
• Pynchon
• pyocyanase
• pyocyanin
• pyogenic
• Pyongyang
• pyorrhea
• pyorrhea alveolaris
• pyorrhoea
• Pyotr Alexeyevich Kropotkin
• Pyotr Ilych Tchaikovsky
• Pyotr Tchaikovsky
• pyracanth
• Pyracantha
• pyralid
• pyralid moth
• Pyralidae
• Pyralididae
• Pyralis
• pyramid
• pyramid bugle
• pyramid plant
• pyramid scheme
• pyramidal