nountē^trasTE^TRAS☆ KeepMeaningthe number fourLewis & Short 1879ModernAs printed, 1879TETRASLEWIS & SHORTTETRAStē^tras, ădis, f., = τετράς, I. the number four, a quaternion, tetrad, Tert. adv. Val. 7; 8; Mart. Cap. 7, § 734.Read the whole entry