Semidiurnal meaning

sĕmē-dī-ûrnəl, sĕmī-
Of, relating to, occurring, or performed during half a day.
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Occurring or coming approximately once every 12 hours, as the tides.
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Of or relating to the arc described by a celestial body between its meridian passage and its points of rising or setting.
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Of, lasting, or performed in half a day.
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Occurring twice a day, as the tides.
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Twice daily (usually of tides).
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Origin of semidiurnal

  • semi- +"Ž diurnal

    From Wiktionary