from The Century Dictionary.
- A series of simplicident rodents; one of three prime divisions of rodents, including the porcupines and their congeners.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an order of rodents including: porcupines; guinea pigs; chinchillas; etc.
Sorry, no etymologies found.
Rat-like Rodents, and _Hystricomorpha_, or Porcupine-like Rodents.
Natural History of the Mammalia of India and Ceylon Robert Armitage Sterndale 1870
Lusty, J.A. et al. "Oestrus and Ovulation in the Casiragua Proechimys quairae (Rodentia, Hystricomorpha)."