Attraction is greatest where intensity is greatest, and there the barometer stands highest, and the diurnal range is least.
All were at a good height, and the whole movement had the air of a diurnal migration.
The Simiid—the most intelligent of the animal kingdom—are all diurnal animals, and essentially arboreal.
From the owls to the diurnal birds of prey it is but a short step.
I shall now give a typical example of diurnal movement induced by variation of light and darkness.
She avoided the house, but sent a woman for her diurnal love letters.
And the dozen years had vindicated his attitude, so that he was as sure of her as he was of the diurnal rotation of the earth.
The part of the entry in the diurnal which deals with them, at least, is probably not contemporary.
Theory of the diurnal variation of the magnetic-needle, illustrated by experiments.
The eyes are diurnal, enabling the creature to hunt only by day.
late 14c., from Late Latin diurnalis "daily," from Latin dies "day" + -urnus, an adjectival suffix denoting time (cf. hibernus "wintery"). Dies "day" is from PIE root *dyeu- "to shine" (cf. Sanskrit diva "by day," Welsh diw, Breton deiz "day;" Armenian tiw; Lithuanian diena; Old Church Slavonic dini, Polish dzień, Russian den), literally "to shine" (cf. Greek delos "clear;" Latin deus, Sanskrit deva "god," literally "shining one;" Avestan dava- "spirit, demon;" Lithuanian devas, Old Norse tivar "gods;" Old English Tig, genitive Tiwes, see Tuesday).
diurnal di·ur·nal (dī-ûr'nəl)
Having a 24-hour period or cycle; daily.
Occurring or active during the daytime rather than at night.