Etymology
Advertisement

octant (n.)

instrument for making angular measurements in navigation or astronomy, 1731, from Late Latin octans "the eighth part," from octo "eight" (see octa-) on analogy of quadrant. In geometry, "the eighth part of a circle," by 1750.

Advertisement
Advertisement
Definitions of octant

octant (n.)
a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration;
From wordnet.princeton.edu