Definitions of diurnal

  1. In the R. C. Church, a breviary with daily services.
  2. A journal; a day- book.
  3. DIURNALLY.
  4. ( biology) 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"
  5. 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"
  6. Daily; recurring every day; performed in a day; going through its changes in a day; constituting the measure of a day; as, a diurnal fever; a diurnal task; diurnal aberration, or diurnal parallax; the diurnal revolution of the earth.
  7. A daybook; a journal.
  8. A diurnal bird or insect.
  9. Relating to the daytime; belonging to the period of daylight, distinguished from the night; - opposed to nocturnal; as, diurnal heat; diurnal hours.
  10. Opening during the day, and closing at night; - said of flowers or leaves.
  11. Active by day; - applied especially to the eagles and hawks among raptorial birds, and to butterflies ( Diurna) among insects.
  12. A small volume containing the daily service for the little hours, viz., prime, tierce, sext, nones, vespers, and compline.
  13. Pertaining to a day; performed in twenty- four hours; daily.
  14. Daily.
  15. Daily: relating to or performed in a day.
  16. Pertaining to the daytime.
  17. Relating to a day or to the daytime; happening every day; performed in a day; performed in twenty- four hours; applied to diseases whose exacerbations are in the daytime.
  18. Pert. to a day; daily; performed in 24 hours.
  19. Opening during the day only; active in the day- time.
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