mathematical instrument, called also a Geometrical Square, and Line of Shadows: it is frequently an additional member on the face of the common quadrant, as also on those of Gunter's and Sutton's quadrants. See Geometry, p. 672, and Plate CCXVII. fig. 1—5.

printing, a piece of metal used to fill up the void spaces between words, &c. There are quadrats of different sizes; as m-quadrats, n-quadrats, &c. Quadratic which are respectively of the dimensions of these letters, only lower, that they may not receive the ink.