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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
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