[L., fem. of triquetrus: see Walde.] † a. A triangle. Obs. b. An ornament of triangular shape, formed of three interlaced arcs or lobes. Also attrib.
1586. Ferne, Blaz. Gentrie, 48. A coate-armor, wherin something would be borne resemblant somewhat to the signes of that art [heraldry], as Circles, Spheres, Triquetras, Pyramides, &c.
1706. Phillips (ed. Kersey), Triquetra, a Triangle, or three-cornered Figure.
1845. Petrie, Round Towers Irel., II. iii. 323. That curious triangular figure, known among medallists by the name of triquetra … formed by the ingenious interlacing of a single cord or line.
1887. J. R. Allen, Early Chr. Symbolism, 111. The foot [of the Irish Cross] is finished off … with a triangular point and a triquetra knot.
