Semidiurnal Definition
sĕmē-dī-ûrnəl, sĕmī-
adjective
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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