Tracker

·noun One who, or that which, tracks or pursues, as a man or dog that follows game.

II. Tracker ·noun In the organ, a light strip of wood connecting (in path) a key and a pallet, to communicate motion by pulling.

black-tracker
n. an aboriginal employed intracking criminals. 1867. `Australia as it is,' pp. 88-9: «The native...

Dictionary of Australasian Words Phrases and Usages by Edward E. Morris