a. rare. [ad. Gr. τριγωνικός triangular, f. τρίγωνος: see TRIGON and -IC.] Of or pertaining to a trigon or triangle.
Trigonic co-ordinates (Geom.), a system of co-ordinates invented by W. Walton in 1868, determining a point in a by the angles subtended at the point by the sides of a fixed triangle.
1788. T. Taylor, Proclus, I. 54. The soul from material triangles or circles, forms in herself the trigonic, or circular species.
So † Trigonical a. rare, = TRIGONAL 3.
1644. Lilly, Merlinus Angl., To Rdr. A j b. The Government of the World by the seven Planetary Angels under the severall Trygonicall Revolutions of Saturne and Iupiter.
