Semidiurnal Definition

sĕmē-dī-ûrnəl, sĕmī-
Of, lasting, or performed in half a day.
Webster's New World
Occurring twice a day, as the tides.
Webster's New World
Of or relating to the arc described by a celestial body between its meridian passage and its points of rising or setting.
American Heritage

Origin of Semidiurnal

  • semi- +"Ž diurnal

    From Wiktionary

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