[f. TRISECT v. + -OR.] One who or that which trisects; spec. in quot. 1872, one who attempts the trisection of an angle.
1864. Athenæum, 27 Aug., 276/3. The trisector of an angle.
1872. De Morgan, Budget of Paradoxes, 71. He is sometimes ranked with the trisectors.
So Trisectory a., having the property of trisecting: applied to certain curves used in the trisection of an angle (Cent. Dict., 1891); Trisectrix [see -TRIX], a line that trisects; spec. a curve used in the trisection of an angle (ibid., Suppl., 1909).
