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sea horse

noun
1.
any fish of the genus Hippocampus, of the pipefish family, having a prehensile tail, an elongated snout, and a head bent at right angles to the body.
2.
a fabled marine animal with the foreparts of a horse and the hind parts of a fish.
3.
a walrus.
Also, seahorse.
Origin
late Middle English
1425-1475
1425-75; late Middle English sehors walrus; compare German Seepferd
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sea-horse

sea horse

noun
1.
any marine teleost fish of the temperate and tropical genus Hippocampus, having a bony-plated body, a prehensile tail, and a horselike head and swimming in an upright position: family Syngnathidae (pipefishes)
2.
an archaic name for the walrus
3.
a fabled sea creature with the tail of a fish and the front parts of a horse
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for sea-horse
n.

late 15c., "walrus," from sea + horse (n.); also see walrus. Also in heraldry as a fabulous animal withy the foreparts of a horse and the tail of a fish. Main modern sense in zoology is attested from 1580s.

Online Etymology Dictionary, © 2010 Douglas Harper
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