Hystricomorpha Hystricomorpha /ˌhɪstrɪkɵˈmɔːrfə/

noun

1. An order of rodents including: porcupines; guinea pigs; chinchillas; etc.  ( Hystricomorpha , suborder Hystricomorpha )
   an order of rodents including: porcupines; guinea pigs; chinchillas; etc.