Word:

Octant

Oc´tant
n.1.(Geom.) The eighth part of a circle; an arc of 45 degrees.
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.
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.
4.(Math. & Crystallog.) One of the eight parts into which a space is divided by three coördinate planes.
Noun1.octant - a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration
limb, measuring device, measuring instrument, measuring system
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octal digit
octal forty
octal notation
octal number system
octal numeration system
Octamerous
Octameter
octander
Octandria
octandrian
octane
octane number
octane rating
octanedioic acid
Octangular
Octans
-- Octant --
Octapla
Octaroon
Octastyle
Octateuch
Octavalent
Octave
Octave flute
Octavian
Octavo
Octene
Octennial
octet
octette
Octic
Octile
Octillion
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