| 单词 | semimajor axis |
| 释义 | semimajor axis in American English (ˈsɛmɪˈmeɪdʒər) Astronomy one half of the longer axis of an elliptical orbit semimajor axis in American English (ˈsemiˈmeidʒər, ˈsemai-, ˌsemi-, ˌsemai-) noun 1. Geometry one half the major axis of an ellipse 2. Astronomy one half the major axis of the ellipse that one celestial body describes around another, as a planet around the sun or a satellite around a planet, equivalent to the mean distance between the two bodies Word origin [1925–30; semi- + major]This word is first recorded in the period 1925–30. Other words that entered Englishat around the same time include: decibel, gimmick, off-line, runout, turnaroundsemi- is a combining form borrowed from Latin, meaning “half,” freely prefixed to Englishwords of any origin, now sometimes with the senses “partially,” “incompletely,” “somewhat”.Other words that use the affix semi- include: semiautomatic, semidetached, semimonthly, semisophisticatedExamples of 'semimajor axis' in a sentence |
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