applicator
noun /ˈæplɪkeɪtə(r)/
  /ˈæplɪkeɪtər/
- a small tool that is used to put a substance onto a surface, or to put something into an object- Use the applicator to apply cream to the affected area.
 Word Originmid 17th cent.: from Latin applicat- ‘fastened to’ (from the verb applicare) + -or.