octant

  1. Noun.  The eighth part of a circle; an arc of 45 degrees.
  2. Noun.  (geometry) : The eighth part of a disc; a sector of 45 degrees; half a quadrant.
  3. Noun.  (nautical) : An instrument for measuring angles, particularly of elevation.

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This entry was last updated on RefTopia from its source on 3/20/2012.