Qua'drant. n.s. [quadrans, Lat.]
- The fourth part; the quarter.
In sixty-three years may be lost eighteen days, omitting the intercalation of one day every fourth year, allowed for this quadrant or six hours supernumerary. Brown.
- The quarter of a circle.
The obliquity of the ecliptick to the equator, and from thence the diurnal differences of the sun's right ascensions, which finish their variations in each quadrant of the circle of the ecliptick, being joined to the former inequality, arising from the excentricity, makes these quarterly and seeming irregular inequalities of natural days. Holder on Time.
- An instrument with which altitudes are taken.
Some had compasses, others quadrants. Tatler, № 81.
Thin taper sticks must from one center part;
Let these into the quadrant's form divide. Gay.