- a person who bet.
Origin of bettor
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for bettor
But a bettor of the right sort slips in an' taps me for odds to a thousand.Thoroughbreds
W. A. Fraser
The action was scarcely performed, when the bettor flung the glove into the air with all his force.The Confessions of Harry Lorrequer, Complete
Charles James Lever (1806-1872)
The bettor's friends at once began sympathizing with him, but he looked at Terry and asked if he considered that a good shot.Fred Fearnot's New Ranch
I was taking the same losing risk as the bettor, with a greater chance for gain.My Adventures with Your Money
George Graham Rice
Frequently the bettor may realize that he has won a point, or two, or three, and may insist upon the bucket shop selling for him.Twenty Years a Detective in the Wickedest City in the World
Clifton R. Wooldridge
Word Origin and History for bettor
also better (OED notes that English agent nouns in -er tend to shift toward -or as their senses become more specific), agent noun from bet (v.).
Online Etymology Dictionary, © 2010 Douglas Harper