normālis, e, adj. [norma], made according to the square: normalis angulus, a right angle, Quint. 11, 3, 141: virgula, a square, Manil. 2, 289: rigores, Aggen. ap. Comm. in Frontin. p. 53 Goes.
Hence, adv.: normālĭter, according to the square, Hyg. de Limit. p. 168 and 176 Goes.