Dragon Drawing

The word dragon derives from Greek δρακων, via Latin draco. It is attested in Middle English from the 13th century, in the context of medieval bestiaries and legends.
The Greek and Latin term referred to any great serpent, not necessarily mythological, and this usage was also current in English up to the 18th century. Today the great komodo lizard Varanus komodoensis is also known in English as the Komodo dragon. The King James Bible uses the words "serpent", "dragon" and "Devil" in a fairly interchangeable manner.
The association of the serpent with a monstrous opponent overcome by a heroic deity has its roots in the mythology of the Ancient Near East, including Canaanite (Hebrew, Ugaritic), Hittite and Mesopotamian. The Chaoskampf motif entered Greek mythology and ultimately Christian mythology, although the serpent motif may already be part of prehistoric Indo-European mythology as well, based on comparative evidence of Indic and Germanic material.
The "European dragon" (and its Near Eastern and Indic cognates) myth has quite different characteristics and origins from those of the Chinese dragon.