Among older people, dehydration is one of the most common hazards of hot, humid weather. See what you can save with the AARP Auto Buying Program. Recent studies have found that even mild dehydration comes with big consequences â from altered mood and impaired memory to headaches and constipation.
diurnal - 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. 2. diurnal - having a daily cycle or occurring every day; diurnal rotation of the heavens.
Definition of calendar. 1  1 : a system for fixing the beginning, length, and divisions of the civil year and arranging days and longer divisions of time (as weeks and months) in a definite order â see month table. 2 : a tabular register of days according to a system usually covering one year and referring the days of each month to the days of the week a desk calendar.