diurnal is an Adverb
[1] Relating to the daytime; belonging to the period of daylight, distinguished from the night; -- opposed to Ant: 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. Shak.
[3] Opening during the day, and closing at night; -- said of flowers or leaves.
[4] 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 twentyfour 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.
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