swordtail

from WordNet (r) 3.0 (2006)

swordtail
    n 1: freshwater fish of Central America having a long swordlike
         tail; popular aquarium fish [syn: {swordtail}, {helleri},
         {topminnow}, {Xyphophorus helleri}]

from The Collaborative International Dictionary of English v.0.48

Swordtail \Sword"tail`\, n. (Zool.)
   (a) The limulus.
   (b) Any hemipterous insect of the genus {Uroxiphus}, found
       upon forest trees.
       [1913 Webster]

[email protected]