Definition of "highlighter"

highlighter

noun
plural highlighters
1. A marker pen used to highlight text.
2. A cosmetic product that reflects light, used to emphasize the contours of the face etc.
3. That which highlights or emphasizes something.
  Quotations
  The IPL was supposed to be a symbol of an ever-more influential, dynamic and prosperous India, a highlighter of its organizational skills and wealth.
  2012, Samir Chopra, Brave New Pitch
  At the same time, art rooted in nature is eminently ephemeral, as human life itself is, and fairy lore again operates as a highlighter of this essential condition through its own distinctive world picture […]
  2011, Dani Cavallaro, The Fairy Tale and Anime, page 147