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semidiurnal

[sem-ee-dahy-ur-nl, sem-ahy-] /ˌsɛm i daɪˈɜr nl, ˌsɛm aɪ-/
adjective
1.
pertaining to, consisting of, or accomplished in half a day.
2.
occurring every 12 hours or twice each day.
Origin of semidiurnal
1585-1595
1585-95; semi- + diurnal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for semidiurnal

semidiurnal

/ˌsɛmɪdaɪˈɜːnəl/
adjective
1.
of or continuing during half a day
2.
occurring every 12 hours
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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