cosmetic

Short definition from Wiktionary

Adjective

1. 1
   Imparting or improving beauty, particularly the beauty of the complexion.
2. 2
   External or superficial; pertaining only to the surface or appearance of something.

Noun

1. 1
   Any substances applied to enhance the external color or texture of the skin, e.g. lipstick, eyeshadow, eyeliner; makeup.
2. 2
   A feature existing only on the surface.
3. 3
   An intangible influence that improves the overall perception of some thing or situation.