Assertion: gazelle's horn | /r/MadeOf | a bony core
Facets:
Source sentences:
text: The horns are made of a bony core encased in a hard material made largely of keratin (the same substance our fingernails are made of!).
text: The horns are made of a bony core encased in a hard material made largely of keratin (the same substance our fingernails are made of!).