Source : Webster's Revised Unabridged Dictionary (1913)

Echidna \E*chid"na\, n. [L., a viper, adder, Gr. ?.]
   1. (Gr. Myth.) A monster, half maid and half serpent.

   2. (Zo["o]l.) A genus of {Monotremata} found in Australia,
      Tasmania, and New Guinea. They are toothless and covered
      with spines; -- called also {porcupine ant-eater}, and
      {Australian ant-eater}.

Source : WordNet®

echidna
     n 1: New Guinea echidnas [syn: {spiny anteater}, {anteater}]
     2: burrowing spine-covered monotreme of Australia having a long
        snout and claws for hunting ants and termites [syn: {spiny
        anteater}, {anteater}]
     [also: {echidnae} (pl)]

Source : Free On-Line Dictionary of Computing

Echidna
     
        {Constraint logic programming} embedded in an
        {object-oriented} language.  The {syntax} is an extension of
        {Edinburgh Prolog}.
     
        ["Hierarchical Arc Consistency Applied to Numeric Processing
        in Constraint Logic Programming", G. Sidebottom et al,
        TR-91-06, CSS-IS, Simon Fraser U, and Comp Intell 8(4)
        (1992)].
     
        {(ftp://cs.sfu.edu/pub/ecl/papers)}.
     
        E-mail: .
     
        (1994-12-08)