flu·o·ro·thene \ˈflu̇rəˌthēn, ˈflōr-, ˈflȯr-\noun (-s) Etymology:fluor- + -thene (from ethylene) : any of various chemically inert insoluble plastics and resins made by polymerizing a derivative CF2:CFCl of ethylene containing three atoms of fluorine and one of chlorine