Strong's G3789 — ὄφις (noun)
ophis (of'-is) n.
1. a snake
2. (figuratively, of sly cunning) an artfully malicious person
3. (especially) Satan
[probably from G3700 (through the idea of sharpness of vision)]
KJV: serpent 
Root(s): G3700 
Hebrew root: ὀπτάνομαι
Occurrences: 14