Webster's English Dictionary

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diurnal

Cross references:
  1. daily                 
 
1. di.ur.nal \di--'*rn-*l\ \-*l-e-\ aj [ME, fr. L diurnalis - more at 
   JOURNAL] 1a: recurring every day {~ task}  1b: having a daily cycle {~ 
   rotation of the heavens}  2a: of, relating to, or occurring in the daytime 
   {the city's ~ noi ses} 2b: opening during the day and closing at night  - 
   di.ur.nal.ly av
2. diurnal n archaic  1: DAYBOOK, DIARY  archaic  2: JOURNAL