sword·tail /ˈsordˌtel, ˈsɔrd-/
  Sword·tail n. Zool. (a) The limulus. (b) Any hemipterous insect of the genus Uroxiphus, found upon forest trees.
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  swordtail
       n : freshwater fish of Central America having a long swordlike
           tail; popular aquarium fish [syn: helleri, topminnow,
            Xyphophorus helleri]