a. Forms: see TRIANGLE sb.; also 5 triangulit, 6–7 -uled. [f. as prec. + -ED; cf. L. triangulāt-us.]
† 1. Three-cornered, triangular. Obs.
1486. Bk. St. Albans, Her., e v. Euery body triangulit is moore of lengthe then of brede and naamly conyt.
a. 1505. in Kingsford, Chron. Lond. (1905), 250. A Cupbourde of 6 stages height, beyng Tryangled.
1570. Billingsley, Euclid, XI. def. x. 314. If the base of a Pyramis be a triangle, then is it called a triangled Pyramis.
1613. Zouch, Dove, 24. Triangl’d Sicily.
1688. R. Holme, Armoury, III. 293/2. There are Round, Square, Triangled,… many cornered,… Pies.
† b. Arith. = TRIANGULAR 2 b. Obs. rare–1.
1603. Holland, Plutarch’s Mor., 796. It [the number of nine] standeth of two triangled numbers, to wit, a senarie and a ternarie.
2. Arranged in a triangle; situated at the angular points of a triangle. ? Obs.
1610. Guillim, Heraldry, III. xxiii. (1611), 167. Fishes are borne … Imbowed, extended, endorsed … fretted and trianguled.
1632. Lithgow, Trav., IV. 135. In one of these triangled points … standeth the Pallace of the Great Turke.
3. Her. Divided into triangles by crossing lines.
c. 1828. Berry, Encycl. Her., I. Gloss., Triangled and Trianglée, formed into triangles, as indentings point in point.
