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definitions

semidiurnal

[ sem-ee-dahy-ur-nl, sem-ahy- ]
/ ˌsɛm i daɪˈɜr nl, ˌsɛm aɪ- /
|

adjective

pertaining to, consisting of, or accomplished in half a day.
occurring every 12 hours or twice each day.

Nearby words

  1. semideify,
  2. semidesert,
  3. semidetached,
  4. semidetached binary,
  5. semidiameter,
  6. semidivine,
  7. semidome,
  8. semidomesticated,
  9. semidominance,
  10. semidouble

Origin of semidiurnal

First recorded in 1585–95; semi- + diurnal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for semidiurnal

  • The semidiurnal tidal forces vanish at the Pole and are very small over the entire Arctic Ocean.

    The North Pole|Robert E. Peary

British Dictionary definitions for semidiurnal

semidiurnal

/ (ˌsɛmɪdaɪˈɜːnəl) /

adjective

of or continuing during half a day
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