Source : Webster's Revised Unabridged Dictionary (1913)

Pipefish \Pipe"fish`\, n. (Zo["o]l.)
   Any lophobranch fish of the genus {Siphostoma}, or
   {Syngnathus}, and allied genera, having a long and very
   slender angular body, covered with bony plates. The mouth is
   small, at the end of a long, tubular snout. The male has a
   pouch on his belly, in which the incubation of the eggs takes
   place.

Source : WordNet®

pipefish
     n : fish with long tubular snout and slim body covered with bony
         plates [syn: {needlefish}]
     [also: {pipefishes} (pl)]