triscele

See triskele. triset, v. and n. An obsolete spelling of tricel. trisect (tri-sekt'), v. t. [ pecially into three equal parts. trisection (trī-sek's hon), n. [= F. trisection = Sp. triseccion = Pg. trisecção = It. trisezione; as trisect + -ion. Cf. section.] The division of a thing into three parts; particularly, in geom., the division of a straight line or an angle into three equal parts. The trisection of an angle, geometrically, was a problem of great celebrity among the Greek mathematicians. It has been proved to be impo ible with the rule and compa alone (though it is of course easy to trisect certain angles), but can be performed with any one of numerous machines which have been invented for the purpose. See cut under linkage. trisectory (trī-sek'tō-ri), a. [ II. n. A trisemic time or syllable.