'Handicapper' definitions:

Definition of 'handicapper'

noun

Someone who sets the betting odds based on calculations of the outcome of a contest (especially a horse race) [syn: odds-maker, handicapper]

From: GCIDE

Handicapper \Hand"i*cap`per\ (-k[a^]p`p[~e]r), n. One who determines the conditions of a handicap. [1913 Webster]