greaseproof paper
noun /ˌɡriːspruːf ˈpeɪpə(r)/
  /ˌɡriːspruːf ˈpeɪpər/
 (British English) [uncountable]- paper that does not let grease, oil, etc. pass through it, used in cooking and for wrapping food in compare waxed paperTopics Cooking and eatingc2