[3207] triangulāris, e (triangulum), dreieckig, amfractus, Mart. Cap. 6. § 579: figura, Boëth. inst. arithm. 2, 6. p. 91, 10 Fr.: forma, Chalcid. Tim. 12. 38. 39: numeri, Boëth. inst. arithm. 2, 4. p. 86, 14 Fr.