noun, genitive Ser·pen·tis [ser-pen-tis] /sərˈpɛn tɪs/. Astronomy.
Examples from the Web for serpens
Buffon himself could not tell whether the animal was a quadruped, or of the order, serpens!The Prairie|J. Fenimore Cooper
Also look at the stars in the head of Serpens, several of which form a figure like a letter X.Astronomy with an Opera-glass|Garrett Putman Serviss
Just south of Serpens and Ophiuchus lies one of the most beautiful and easily recognized constellations in the heavens.Astronomy for Young Folks|Isabel Martin Lewis
We now pass northward to the region covered by map No. 14, including the remainder of Ophiuchus and Serpens.Pleasures of the telescope|Garrett Serviss
Grandmother—ingress of Crab—conjunction of Scorpio with Serpens—moon in eleventh house.The Prophet of Berkeley Square|Robert Hichens