ὄφις (óphis|of'-is|noun|snake)
[Grk] ὄφις LN: 4.52, 88.123 GK: G4058 Hebrew: אֶפְעֶה‎, נָחָשׁ‎, שָׂרָף‎
Derivation: probably from ὀπτάνομαι (through the idea of sharpness of vision);
Strong's: a snake, figuratively, (as a type of sly cunning) an artful malicious person, especially Satan
KJV: --serpent.
See: ὀπτάνομαι