Diuretic (Di`u*ret"ic) a. [L. diureticus, Gr. fr. to make water; through + to make water, fr. urine: cf. F.
diurétique.] (Med.) Tending to increase the secretion and discharge of urine. n. A medicine with
diuretic properties.
Diuretic salt (Med.), potassium acetate; so called because of its diuretic properties.
Diuretical (Di`u*ret"ic*al) a. Diuretic. [Obs.] Boyle.
Diureticalness (Di`u*ret"ic*al*ness), n. The quality of being diuretical; diuretic property.
Diurna (||Di*ur"na) n. pl. [NL., fr. L. diurnus belonging to the day.] (Zoöl.) A division of Lepidoptera,
including the butterflies; so called because they fly only in the daytime.
Diurnal (Di*ur"nal) a. [L. diurnalis, fr. dies day. See Deity, and cf. Journal.]
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. Shak. 3. (Bot.) Opening during the day, and closing at night; said of flowers or leaves.
4. (Zoöl.) 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.
Syn. See Daily.
Diurnal (Di*ur"nal) n. [Cf. F. diurnal a prayerbook. See Diurnal, a.]
1. A daybook; a journal. [Obs.] Tatler.
2. (R. C. Ch.) A small volume containing the daily service for the "little hours," viz., prime, tierce, sext,
nones, vespers, and compline.
3. (Zoöl.) A diurnal bird or insect.
Diurnalist (Di*ur"nal*ist), n. A journalist. [Obs.] Bp. Hall.
Diurnally (Di*ur"nal*ly), adv. Daily; every day.
Diurnalness (Di*ur"nal*ness), n. The quality of being diurnal.
Diurnation (Di`ur*na"tion) n.
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