- 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.
- [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.
Etymology: F. trais. pl. of trait. See Trait