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sem·i·di·ur·nal AHD[sĕm'ē-dī-ûrʹnəl, sĕm'ī-] D.J.[ˌsemiːdaɪˈɜːnəl, ˌsemaɪ-]K.K.[ˌsɛmidaɪˈɝnəl, ˌsɛmaɪ-]adj.（形容词）- Of, relating to, occurring, or performed during half a day.半天的：半天的、与之相关的、出现于其的或完成于其的
- Occurring or coming approximately once every 12 hours, as the tides.一天两次的：近乎每12小时出现或发生一次的，如潮汐
- Of or relating to the arc described by a celestial body between its meridian passage and its points of rising or setting.半日圆拱：天体在其子午圈与升落位置之间描出的圆拱轨迹的或与之相关的
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