treatise

[tree-tis]
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noun
  1. a formal and systematic exposition in writing of the principles of a subject, generally longer and more detailed than an essay.

Origin of treatise

1300–50; Middle English tretis < Anglo-French tretiz, akin to Old French traitier to treat
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British Dictionary definitions for treatise

treatise

noun
  1. a formal work on a subject, esp one that deals systematically with its principles and conclusions
  2. an obsolete word for narrative

Word Origin for treatise

C14: from Anglo-French tretiz, from Old French tretier to treat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for treatise
n.

c.1300, from Anglo-French tretiz (mid-13c.), contracted from Old French traiteiz, from Gallo-Romance *tractaticius, from Latin tractare "to deal with" (see treat).

Online Etymology Dictionary, © 2010 Douglas Harper