Assertion: frontal bone | /r/HasProperty | bone
Facets:
Source sentences:
text: A grating sound in or around the frontal bone, which may be joints or bones rubbing against each other.
text: It is one of eight bones that form the cranium, or brain case.
text: The frontal bone is one of the eight bones that together form the cranium, otherwise known as the protective case of the brain.