sem·i·di·ur·nal (s m  -d -ûr n l, sm-)adj. 1. Of, relating to, occurring, or performed during half a day. 2. Occurring or coming approximately once every 12 hours, as the tides. 3. Of or relating to the arc described by a celestial body between its meridian passage and its points of rising or setting. |
semidiurnal [ˌsɛmɪdaɪˈɜːnəl]
adj
1. of or continuing during half a day
2. occurring every 12 hours
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