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Valid in these dictionaries

TWL/NWL (Scrabble US/CA/TH)
SOWPODS/CSW (Scrabble UK / ALL)
ENABLE (Words with Friends)

Meaning of diurnal

1 definition found

From WordNet (r) 3.0 (2006) [wn]:

  diurnal
      adj 1: of or belonging to or active during the day; "diurnal
             animals are active during the day"; "diurnal flowers are
             open during the day and closed at night"; "diurnal and
             nocturnal offices" [ant: {nocturnal}]
      2: having a daily cycle or occurring every day; "diurnal
         rotation of the heavens"

Source : WordNet ® Princeton University. 2010.

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OCTWL / TWL : The official dictionary for scrabble game in United States, Canada and Thailand.
SOWPODS / CSW : UK and the rest of the world uses this dictionary for various word games including scrabble.
ENABLE - This is the default dictionary for Words with Friends.

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