Noah Webster
Serpentine
SER'PENTINE, adjective [Latin serpentinus, from serpens.]
1. Resembling a serpent; usually, winding and turing one way and the other, like a moving serpent; anfractuous; as a serpentine road or course.
2. Spiral; twisted; as a serpentine worm of a still.
3. Like a serpent; having the color or properties of a serpent.
Serpentine tongue, in the manege. A horse is said to have a serpentine tongue, when he is constantly moving it, and sometimes passing it over the bit.
Serpentine verse, a verse which begins and ends with the same word.