Echidna1. (n.) A monster, half maid and half serpent.
2. (n.) 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.
Thesaurus Entries
Argus, Briareus, Cerberus, Charybdis, Cyclops, Echidna, Gila monster, Gorgon, Harpy, Hydra, Loch Ness monster, Mafioso, Medusa, Minotaur, Pegasus, Python, Scylla, Sphinx, Talos, Tartar, Typhon, Young Turk, agama, alligator, anole, bear, bearded lizard, beast, beldam, berserk, berserker, blindworm, bomber, box turtle, brute, butterfly agama, cayman, centaur, chameleon, chimera, cockatrice, crank, crocodile, crosspatch, demon, devil, diamondback, drake, false map turtle, feist, fiend, fire-eater, firebrand, flying dragon, fury, gavial, gecko, girdle-tailed lizard, glass snake, goon, gorilla, green turtle, griffin, grizzly bear, grouch, gunsel, hardnose, hawksbill, hawksbill turtle, hell-raiser, hellcat, hellhound, hellion, hippocampus, holy terror, hood, hoodlum, hothead, hotspur, iguana, incendiary, killer, leatherback, lizard, mad dog, madcap, matamata, mermaid, merman, monitor, monster, mugger, nixie, ogre, ogress, rapist, revolutionary, roc, salamander, satyr, savage, sea horse, sea serpent, sea turtle, she-wolf, siren, soft-shelled turtle, sorehead, spitfire, stump tail, teju, termagant, terrapin, terror, terrorist, tiger, tigress, tortoise, tough, tough guy, troll, tuatara, turtle, ugly customer, unicorn, vampire, violent, virago, vixen, werewolf, wild beast, windigo, witch, wolf, xiphopagus, zombie