Semidiurnal
Semidiurnal Sem`i*di*ur"nal, a. 1. Pertaining to, or accomplished in, half a day, or twelve hours; occurring twice every day. [1913 Webster]

2. Pertaining to, or traversed in, six hours, or in half the time between the rising and setting of a heavenly body; as, a semidiurnal arc. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • semidiurnal — [sem΄idī ʉr′nəl] adj. 1. of, lasting, or performed in half a day 2. occurring twice a day, as the tides …   English World dictionary

  • semidiurnal — adjective Date: 1594 1. relating to or accomplished in half a day 2. occurring twice a day 3. occurring approximately every half day < the semidiurnal tides > …   New Collegiate Dictionary

  • semidiurnal — | ̷ ̷(ˌ) ̷ ̷ at semi + adjective Etymology: semi + diurnal 1. : relating to or accomplished in half a day 2. : occurring twice a day 3. : occurring approximately every half day the semidiurnal tides * * * …   Useful english dictionary

  • semidiurnal — /sem ee duy err nl, sem uy /, adj. 1. pertaining to, consisting of, or accomplished in half a day. 2. occurring every 12 hours or twice each day. [1585 95; SEMI + DIURNAL] * * * …   Universalium

  • semidiurnal — adjective Twice daily …   Wiktionary

  • semidiurnal — adj. lasting half a day; happening about once every twelve hours …   English contemporary dictionary

  • semidiurnal — semi·diurnal …   English syllables

  • semidiurnal — sem•i•di•ur•nal [[t]ˌsɛm i daɪˈɜr nl, ˌsɛm aɪ [/t]] adj. 1) pertaining to, consisting of, or accomplished in half a day 2) occurring every 12 hours or twice each day • Etymology: 1585–95 …   From formal English to slang

  • semidiurnal — /ˌsɛmidaɪˈɜnəl/ (say .semeeduy ernuhl) adjective 1. relating to, consisting of, or accomplished in half a day. 2. occurring every twelve hours …   Australian English dictionary

  • semidiurnal tide — a tide with two high and two low waters in a tidal day with comparatively little diurnal tide inequality. The commonest type of tide …   Dictionary of ichthyology

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