Assertion: sperm whale's head | /r/MadeOf | the spermaceti organ
Facets:
Source sentences:
text: The sperm whale's head contains the spermaceti organ which produces a waxy fluid called spermaceti or sperm oil.
text: The head contains a spermaceti organ whose function is not entirely known.
text: The large, square shaped head represents about one-third of the total body length and contains the spermaceti organ; this organ is filled with a waxy liquid called spermaceti, which is involved in sound production and echolocation.