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 | |

4. | (Math. & Crystallog.) One of the eight parts into which a space is divided by three coördinate planes. |

Noun | 1. | octant - a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration |

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**-- Octant --**

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Octangular

Octans

Octapla

Octaroon

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Octave flute

Octavian

Octavo

Octene

Octennial

octet

octette

Octic

Octile

Octillion