silicone

/ˈsɪlɪkəʊn/

IPA: /S IH1 L AH0 K OW0 N/

noun
  1. 1

    Any of a class of inert, semi-inorganic polymeric compounds (polysiloxanes), that have a wide range of thermal stability and extreme water repellence, used in a very wide range of industrial applications, and in prosthetic replacements for body parts.

Source: https://en.wiktionary.org/wiki/silicone