(?), n. [L. octans, -antis. fr. octo eight. See Octave.] 1. (Geom.) The eighth part of a circle; an arc of 45 degrees.
[1913 Webster]

2. (Astron. & Astrol.) The position or aspect of a heavenly body, as the moon or a planet, when half way between conjunction, or opposition, and quadrature, or distant from another body 45 degrees.
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3. An instrument for measuring angles (generally called a quadrant), having an arc which measures up to 9O, but being itself the eighth part of a circle. Cf. Sextant.
[1913 Webster]

4. (Math. & Crystallog.) One of the eight parts into which a space is divided by three cordinate planes.
[1913 Webster]


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