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Yes, semidiurnal is playable

...and is worth 18 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Semidiurnal" Definition

adjective

Occurring or coming approximately once every 12 hours, as the tides.
Of or relating to the arc described by a celestial body between its meridian passage and its points of rising or setting.
Of, relating to, occurring, or performed during half a day.
Relating to or accomplished in half a day.
Occurring twice a day.

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