Tract

noun
1.
an expanse or area of land, water, etc.; region; stretch.
2.
Anatomy.

a definite region or area of the body, especially a group, series, or system of related parts or organs:
the digestive tract.
a bundle of nerve fibers having a common origin and destination.

3.
a stretch or period of time; interval; lapse.
4.
Roman Catholic Church. an anthem consisting of verses of Scripture, sung after the gradual in the Mass from Septuagesima until the day before Easter and on certain other occasions, taking the place of the alleluias and the verse that ordinarily accompany the gradual.
5.
Ornithology. a pteryla.
noun
1.
a brief treatise or pamphlet for general distribution, usually on a religious or political topic.
noun
1.
an extended area, as of land
2.
(anatomy) a system of organs, glands, or other tissues that has a particular function: the digestive tract
3.
a bundle of nerve fibres having the same function, origin, and termination: the optic tract
4.
(archaic) an extended period of time
noun
1.
a treatise or pamphlet, esp a religious or moralistic one
noun
1.
(RC Church) an anthem in some Masses

tract (trākt)
n.

An elongated assembly of tissue or organs having a common origin, function, and termination, or a serial arrangement having a common function.

A bundle of nerve fibers having a common origin, termination, and function.

tract
(trākt)

A series of body organs that work together to perform a specialized function, such as digestion.

A bundle of nerve fibers, especially in the central nervous system, that begin and end in the same place and share a common function.