Diurnal
/daɪˈɜːrnəl/noun
Relating to the day or occurring during daylight hours.
Did you know?It comes through Latin from *diurnus*, a word tied to the daily cycle of sunlight, and that same root also lives on in legal and literary words about fixed daily records.
Etymological Timeline
Proto-Indo-European
PIE
*dyeu-
“to shine; sky, daylight”
Latin
Latin
dies
“day”
Late Latin
Latin
diurnus
“of the day; lasting a day”
Old French
Old French
diurne
“daily; by day”
Middle English
English
diurnal
“of or belonging to the day”