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1789, Olaudah Equiano, chapter 9, in The Interesting Narrative, volume I:
One morning we had vast quantities of sea-horses about the ship, which neighed exactly like any other horses.
Any of various small marine fish of the genus Hippocampus that have a horselike head and swim upright.
(philately) any of a series of British high value stamps issued during the reign of King George V featuring a depiction of Britannia on a chariot in choppy seas.