di·ur·nal (d -ûr n l)adj. 1. Relating to or occurring in a 24-hour period; daily. 2. Occurring or active during the daytime rather than at night: diurnal animals. 3. Botany Opening during daylight hours and closing at night. n. 1. A book containing all the offices for the daily canonical hours of prayer except matins. 2. Archaic a. A diary or journal. b. A daily newspaper. [Middle English, from Late Latin diurn  lis, from Latin diurnus, from di s, day; see dyeu- in Indo-European roots.]di·ur nal·ly adv. |
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