The Collaborative International Dictionary
Hystricomorphous
Hystricomorphous \Hys`tri*co*mor"phous\, a. [Hystrix + Gr. morfh` form.] (Zo["o]l.) Like, or allied to, the porcupines; -- said of a group ( Hystricomorpha) of rodents.
Wiktionary
hystricomorphous
a. (context zoology English) Like, or allied to, the porcupines; applied to the rodent group Hystricomorpha.