seahorse

from WordNet (r) 3.0 (2006)
seahorse
    n 1: either of two large northern marine mammals having ivory
         tusks and tough hide over thick blubber [syn: {walrus},
         {seahorse}, {sea horse}]
    2: small fish with horse-like heads bent sharply downward and
       curled tails; swim in upright position [syn: {seahorse}, {sea
       horse}]
    

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