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semidiurnal

[sem-ee-dahy-ur-nl, sem-ahy-]

adjective

pertaining to, consisting of, or accomplished in half a day.

occurring every 12 hours or twice each day.

Origin:
1585–95; semi- + diurnal

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To semidiurnal

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Semidiurnal has a plethora of syllables.

So is antidisestablishmentarianism. Does it mean:

a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.

opposition to the withdrawal of state support or recognition from an established church, esp. the Anglican Church in 19th-century England.

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Collins

World English Dictionary

semidiurnal (ˌsɛmɪdaɪˈɜːn^əl)

—*adj*
1.	of or continuing during half a day
2.	occurring every 12 hours

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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semidiurnal

sem·i·di·ur·nal