serpent

Short definition from Wiktionary

Noun

1. 1
   A snake, especially a large or dangerous one.
2. 2
   A subtle, treacherous, malicious person.
3. 3
   An obsolete wind instrument in the brass family, whose shape is suggestive of a snake (Wikipedia article).
4. 4
   A kind of firework with a serpentine motion.
5. 5
   A snake-like monster, such as a dragon or sea serpent.

Verb

1. 1
   To wind or meander
2. 2
   To encircle.

Proper noun

1. 1
   Synonym of Serpens (a constellation).
2. 2
   Synonym of Satan.