'Tracker' definitions:

Definition of 'tracker'

noun

Someone who tracks down game

From: GCIDE

Tracker \Track"er\, n.
1. One who, or that which, tracks or pursues, as a man or dog that follows game. [1913 Webster]
And of the trackers of the deer Scarce half the lessening pack was near. --Sir W. Scott. [1913 Webster]
2. (Mus.) In the organ, a light strip of wood connecting (in path) a key and a pallet, to communicate motion by pulling. [1913 Webster]