A prerecorded piece of music used to accompany a musician who sings live

A boat towed by a line from the shore.

plural of track-boat

(archaic) A towpath.

plural of track-road

(rail transport) Alternative form of trackworker.

plural of track worker

The conspicuous signs of artery and vein damage brought on by chronic injection of drugs.

(Scrabble) The act of keeping track of which letters have been played, usually by crossing them off a printed list.

(education, of a professorship or other academic job) Possessing contractually guaranteed terms of employment specifying that, after a period of time, the employed person will be considered for tenure status, which typically confers enhanced job security and sometimes other benefits.