Assertion: porcupine's spine | /r/Synonym | quill
Facets:
Source sentences:
text: Those needle-like spines we mentioned earlier are actually called quills.
text: Porcupines have long, sharp and barbed spines (quills) embedded in the skin muscles.
text: Spines called quills are found on the backs of porcupines from the head to the tail.
text: Porcupines are rodents with sharp spines called quills.