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Definition of echidna:

  1. 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.
  2. A monster, half maid and half serpent.

Synonyms:

scaly anteater, numbat, anteater, spiny anteater, banded anteater, pangolin, ant bear, aardvark.

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