Assertion: unicorn's horn | /r/HasProperty | the tusks of narwhals
Facets:
value: really
type: DEGREE
value: often
type: TEMPORAL
Source sentences:
text: Entire horns were very precious in the Middle Ages and were often really the tusks of narwhals.
text: In 1638, however, the Danish zoologist Ole Wurm proved that these "unicorn" horns were in fact the tusks of narwhals,