| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024oc•tant (ok′tənt),USA pronunciation n. - Mathematicsthe eighth part of a circle.
- Mathematicsany of the eight parts into which three mutually perpendicular planes divide space.
- Surveyingan instrument having an arc of 24°, used by navigators for measuring angles up to 90°.
- Astronomythe position of one heavenly body when 45° distant from another.
- Astronomy(cap.) the constellation Octans.
- Latin octant- (stem of octāns); see Octans
- 1680–90;
Collins Concise English Dictionary © HarperCollins Publishers:: octant /ˈɒktənt/ n - any of the eight parts into which the three planes containing the Cartesian coordinate axes divide space
- an eighth part of a circle
- the position of a celestial body when it is at an angular distance of 45° from another body
- an instrument used for measuring angles, similar to a sextant but having a graduated arc of 45°
Etymology: 17th Century: from Latin octans half quadrant, from octo eight |