treatises is a form of:

Treatise



noun
1.
~ (on something) (written or printed exposition of a subject, thesis, monograph, study, disquisition, tract, essay, dissertation) អភិប្រាយ, ឯកសារ
2.
(បច្ចេកទេស) (on something) អភិប្រាយ, សន្ធិសញ្ញា
ENGLISH MEANING
noun
1.
A written composition on a particular subject, in which its principles are discussed or explained; a tract.
1.
Story, discourse