| 单词 | octant |
| 释义 | octant —octantal /ok tan"tl/, adj. /ok"teuhnt/, n. 1. the eighth part of a circle. 2. Math. any of the eight parts into which three mutually perpendicular planes divide space. 3. an instrument having an arc of 24°, used by navigators for measuring angles up to 90°. 4. the position of one heavenly body when 45° distant from another. 5. (cap.) Astron. the constellation Octans. [1680-90; < L octant- (s. of octans); see OCTANS] |
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