Obs. Also 7 -our, -or. [f. prec. sb. or vb. + -ER1.] The writer of a treatise.

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1604.  Hieron, Wks., I. 518. I remember a saying of S. Hieromes; ‘I know … that I otherwise esteeme of the apostles then of other treatisers.’

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1610.  Bp. Hall, Apol. Brownists, lv. 136. The poysoned workes of Origen, and other dangerous Treatisours.

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1637.  C. Dow, Answ. to H. Burton, 169. Answering a Popish treatisor.

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1646.  R. Baillie, Anabaptism (1647), 178. Unto those Arguments … the Treatiser adds nothing considerable.

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