WordReference Random House Unabridged Dictionary of American English © 2025
As•tro•turf  (as′trə tûrf′),USA pronunciation [Trademark.]
  1. Textiles, Trademarksa brand of carpetlike covering made of vinyl and nylon to resemble turf, used for athletic fields, patios, etc.

Collins Concise English Dictionary © HarperCollins Publishers::
Astroturf / ˈæstrəʊˌtɜːf/
  1. a type of grasslike artificial surface used for playing fields and lawns
  2. (usually not capital) a person who is paid to display overt and apparently spontaneous grassroots support for a particular product, policy, or event
  3. (as modifier)
  1. (usually not capital) to pay people to display overt and apparently spontaneous grassroots support for a particular product, policy, or event
Etymology: 20th Century: from Astro(dome), the baseball stadium in Houston, Texas where the surface was first used + turf; senses 2 and 3 alluding to artificial grassroots support

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