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