Serpens
noun
Ser·pens ˈsər-ˌpenz 
astronomy
: a northern constellation that is visible in two parts on either side of the constellation Ophiuchus and that is represented by the figure of a serpent in the grasp of a man represented by Ophiuchus
Note: The constellation Serpens is divided into two separate sections, called Serpens Caput (the "head of the serpent") and Serpens Cauda (the "tail of the serpent").
The main object of interest in Serpens Caput is the globular cluster M5, down in the south of the region, near the border with Virgo. 
Adrian Berry, Daily Telegraph (London), 1 June 2009
Adrian Berry, Daily Telegraph (London), 1 June 2009Their latest discovery is a double star in the planetary nebula cataloged as Abell 41, located in the constellation Serpens Cauda. These stars orbit each other in only 2 hours and 43 minutes, indicating that they are extremely close together. D. E. Thomsen, Science News, 16 Apr. 1983
D. E. Thomsen, Science News, 16 Apr. 1983
Word History
First Known Use
1715, in the meaning defined above