tract

tract

noun \ˈtrakt\

Definition of TRACT

1

: a system of body parts or organs that act together to perform some function <the digestive tract>—see gastrointestinal tract, lower respiratory tract, upper respiratory tract

2

: a bundle of nerve fibers having a common origin, termination, and function and especially one within the spinal cord or brain—called also fiber tract; see corticospinal tract, olfactory tract, optic tract, spinothalamic tract; compare fasciculus b