Is Jell-O flavored plastic?

Per [this](https://www.scientificamerican.com/article/what-is-jell-o-how-does-i/) article, "Gelatin is a thermoreversible, cold-setting polymer." Further, Jell-O is flavored gelatin.


Is the phrase "thermoreversible, cold-setting polymer" equivalent to the term "plastic?"


Is Jell-O, therefore and despite the unappealing sound of it, flavored plastic? 


