Also see definition of "White Horse" in Bible Study Dictionaries
Word Study
White Horse
CIDE DICTIONARY
White Horse,
A large mass of tough sinewy substance in the head of sperm whales, just above the upper jaw and extending in streaks into the junk above it. It resembles blubber, but contains no oil. Also, the part of the head in which it occurs. [Webster 1913 Suppl.]
Also see definition of "White Horse" in Bible Study Dictionaries
For further exploring for "White Horse" in Webster Dictionary Online