ˈsiləˌkōn noun
( -s )
Etymology: silic- + -one
1.
a. : an organic compound R 2 SiO analogous to a ketone
b. : an organic siloxane ; especially : any of a large group of polymerized organic siloxanes that are unusually stable over a wide temperature range, that are obtained as oily fluids, resins, and elastomers convertible into greases and other compounds, coatings, and rubbers, and that are used chiefly in waterproofing, lubrication, and electric insulation — see bouncing putty
2. : an organosilicon compound in which silicon is attached directly to carbon — used chiefly commercially