claimer

noun4

1. •
   A person who makes a claim; a claimant.
2. •
   A pretender to a royal title.
3. •
   A claiming race.

   • He did not have a proper claiming authorization on file, and contended that the trainer had not asked his permission to enter the horse in a claimer. — 2002
4. •
   A racehorse offered for sale before a race and delivered to the buyer afterwards.