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Diurnal   /daɪˈərnəl/   Listen
adjective
Diurnal  adj.  
1.
Relating to the daytime; belonging to the period of daylight, distinguished from the night; opposed to nocturnal; as, diurnal heat; diurnal hours.
2.
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. "Ere twice the horses of the sun shall bring Their fiery torcher his diurnal ring."
3.
(Bot.) Opening during the day, and closing at night; said of flowers or leaves.
4.
(Zool.) Active by day; applied especially to the eagles and hawks among raptorial birds, and to butterflies (Diurna) among insects.
Diurnal aberration (Anat.), the aberration of light arising from the effect of the earth's rotation upon the apparent direction of motion of light.
Diurnal arc, the arc described by the sun during the daytime or while above the horizon; hence, the arc described by the moon or a star from rising to setting.
Diurnal circle, the apparent circle described by a celestial body in consequence of the earth's rotation.
Diurnal motion of the earth, the motion of the earth upon its axis which is described in twenty-four hours.
Diurnal motion of a heavenly body, that apparent motion of the heavenly body which is due to the earth's diurnal motion.
Diurnal parallax. See under Parallax.
Diurnal revolution of a planet, the motion of the planet upon its own axis which constitutes one complete revolution.
Synonyms: See Daily.



noun
Diurnal  n.  
1.
A daybook; a journal. (Obs.)
2.
(R. C. Ch.) A small volume containing the daily service for the "little hours," viz., prime, tierce, sext, nones, vespers, and compline.
3.
(Zool.) A diurnal bird or insect.






Collaborative International Dictionary of English 0.48








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"Diurnal" Quotes from Famous Books



... she now, no force; She neither hears nor sees; Roll'd round in earth's diurnal course With rocks, ...
— The Golden Treasury - Of the Best Songs and Lyrical Poems in the English Language • Various

... learning and loyalty. Here he began a paper war with the opposite party, and wrote some smart satires against the Rebels, especially the Scots. His poem called the Mixt Assembly; his character of a London Diurnal, and a Committee-man, are thought to contain the true spirit of satire, and a just representation of the general confusion of the times. From Oxford he went to the garrison of Newark, where he acted as judge advocate till that garrison was surrendered, and by an excellent temperature, of both, ...
— The Lives of the Poets of Great Britain and Ireland (1753) - Volume II • Theophilus Cibber

... evening, from every village within three or four miles of the metropolis, may be remarked a tide of young men wending diurnal way to and from their respective desks and counters in the city, preceded by a ripple of errand-boys, and light porters, and followed by an ebb of plethoric elderly gentlemen in drab gaiters. Now these individuals compose—for the ...
— Punch, or the London Charivari, Volume 1, Complete • Various

... thews upon their calves. Another is impatient for their place. But they strain still, locked together, and forgetful of the world. At length they have enough: then slowly, clingingly unclasp, turn round with gazing eyes, and are resumed, sedately, into the diurnal round of common life. Another pair is in their room upon ...
— Sketches and Studies in Italy and Greece • John Addington Symonds

... Whatever idea may be adopted on this subject, if it is very certain that, independent of those exterior causes, which are competent to totally change its face, as the impulse of a comet may do, this globe contains within itself, a cause adequate to alter it entirely, since, besides the diurnal and sensible motion of the earth, it has one extremely slow, almost imperceptible, by which every thing must eventually be changed in it: this is the motion from whence depends the precession of the equinoctial points, observed by Hipparchus and other mathematicians, now well understood ...
— The System of Nature, Vol. 2 • Baron D'Holbach


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