The Collaborative International Dictionary of English v.0.48:

White horse \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.]

WordNet (r) 3.0 (2006):

white horse
    n 1: a wave that is blown by the wind so its crest is broken and
         appears white [syn: whitecap, white horse]

U.S. Gazetteer Places (2000):

White Horse, NJ -- U.S. Census Designated Place in New Jersey
   Population (2000):    9373
   Housing Units (2000): 3818
   Land area (2000):     3.186118 sq. miles (8.252007 sq. km)
   Water area (2000):    0.132135 sq. miles (0.342228 sq. km)
   Total area (2000):    3.318253 sq. miles (8.594235 sq. km)
   FIPS code:            80630
   Located within:       New Jersey (NJ), FIPS 34
   Location:             40.191659 N, 74.701191 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    White Horse, NJ
    White Horse


U.S. Gazetteer Places (2000):

White Horse, SD -- U.S. Census Designated Place in South Dakota
   Population (2000):    180
   Housing Units (2000): 39
   Land area (2000):     3.152266 sq. miles (8.164330 sq. km)
   Water area (2000):    0.038697 sq. miles (0.100224 sq. km)
   Total area (2000):    3.190963 sq. miles (8.264554 sq. km)
   FIPS code:            71150
   Located within:       South Dakota (SD), FIPS 46
   Location:             43.300320 N, 100.602901 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    White Horse, SD
    White Horse