Ashmog (Zend). The Dragon or Serpent, a monster with a camel’s neck in the Avesta; a kind of allegorical Satan, who after the Fall, “lost its nature and its name”. Called in the old Hebrew (Kabbalistic) texts the “flying camel”; evidently a reminiscence or tradition in both cases of the prehistoric or antediluvian monsters, half bird, half reptile.

Source: H.P.Blavatsky - The Theosophical Glossary