tractate

n. treatise, tract

Tract may be a reference to:tract (anatomy), a bundle of nerve fibers following a path through the brain, or a collection of related anatomic structures (e.g. gastrointestinal tract, genitourinary tract).tract (literature), a short written work, usually of a political or religious nature;tract (geography), a section of land;Tract (liturgy), component of Roman Catholic liturgy, a dirge used during the season of Lent.
See more at Wikipedia.org...

(n.)
A treatise; a tract; an essay.