
1) Aquarium critter 2) Bony-plated fish 3) Coral reef inhabitant 4) Cousin of a stickleback 5) Equine-looking fish 6) Fabled marine creature 7) Fish 8) Fish in the genus Hippocampus 9) Fish that can twine its tail 10) Fish that sings when mating 11) Fish that swims upright 12) Fish with a gripping tail
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https://www.crosswordclues.com/clue/seahorse

1) Walrus
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https://www.crosswordclues.com/clue/seahorse

Seahorse is the name given to 54 species of marine fishes in the genus Hippocampus. `Hippocampus` comes from the Ancient Greek hippos meaning `horse` and kampos meaning `sea monster`. ==Habitat== Seahorses are mainly found in shallow tropical and temperate waters throughout the world, and live in sheltered areas such as seagrass beds, estuar...
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http://en.wikipedia.org/wiki/Seahorse
[software] Seahorse is a GNOME front-end application for managing PGP and SSH keys. Seahorse integrates with Nautilus, gedit and Evolution for encryption, decryption and other operations. It has HKP and LDAP key server support. The program is based on GNU Privacy Guard (GPG) and is released as free software under the GNU General Public Lice...
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http://en.wikipedia.org/wiki/Seahorse_(software)

any of a number of species of small marine fishes of the family Syngnathidae (order Gasterosteiformes), found in warm seas. Sea horses are familiar ... [1 related articles]
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http://www.britannica.com/eb/a-z/s/53

HMS Seahorse was a British Sealion Class submarine of 715 tons displacement launched during the early 1940's and sunk during the Second World War. HMS Seahorse was armed with one 3-inch gun; one 20 mm anti-aircraft gun; three machine-guns; six 21-inch torpedo tubes in the bow and one external 21 inch torpedo tube. She had a top speed of 14.5 knots ...
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http://www.probertencyclopaedia.com/browse/RS.HTM

[
n] - small fish with horselike heads bent sharply downward and curled tails
Found on
http://www.webdictionary.co.uk/definition.php?query=seahorse
sea horse noun small fish with horselike heads bent sharply downward and curled tails; swim in upright position
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https://www.encyclo.co.uk/local/20974
No exact match found.