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Definition of Diurnal
Di`ur´nal | a. | 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. | | 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. | | n. | 1. | A daybook; a journal. | | 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. |
Related Words
annual, biannual, biennial, bimonthly, biweekly, catamenial, centenary, centennial, circadian, daily, daytime, decennial, everyday, fortnightly, hebdomadal, hourly, menstrual, momentary, momently, monthly, quarterly, quotidian, regular, secular, semestral, semiannual, semimonthly, semiweekly, semiyearly, tertian, triennial, weekly, yearly
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