brightener
/ˈbraɪtənər/
noun
- A substance or product used to make something whiter, brighter, or more colorful.
- Some toothpastes contain a brightener to help remove stains.
- This optical brightener is used in paper to make it appear whiter.
- She added laundry brightener to make the white shirts look new.
- Something that makes a person feel happier or more cheerful.
- A surprise visit from a friend can be a real brightener.
- Her funny stories were always a brightener on gloomy days.
- He considered his morning coffee a necessary brightener.