Trace \Trace\, n. [F. trais. pl. of trait. See {Trait}.] 1. One of two straps, chains, or ropes of a harness, extending from the collar or breastplate to a whiffletree attached to a vehicle or thing to be drawn; a tug. [1913 Webster] 2. (Mech.) A connecting bar or rod, pivoted at each end to the end of another piece, for transmitting motion, esp. from one plane to another; specif., such a piece in an organ-stop action to transmit motion from the trundle to the lever actuating the stop slider. [Webster 1913 Suppl.]