halfer

noun3

1. •
   With regard to the Sleeping Beauty problem: one who argues that the probability of heads is 1/2.
2. •
   (no longer used) One who possesses or gives half only; one who shares.

   • such Halfers in opinions — 1625
3. •
   (no longer used) A gelded male fallow deer.

   • Bucks , when cut , called Halfers — 1814