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diurnal    音標拼音: [dɑɪ'ɚnəl]
a. 每日的,一日間的,白天的

每日的,一日間的,白天的

diurnal
adj 1: of or belonging to or active during the day; "diurnal
animals are active during the day"; "diurnal flowers are
open during the day and closed at night"; "diurnal and
nocturnal offices" [ant: {nocturnal}]
2: having a daily cycle or occurring every day; "diurnal
rotation of the heavens"

Diurnal \Di*ur"nal\, n. [Cf. F. diurnal a prayerbook. See
{Diurnal}, a.]
1. A daybook; a journal. [Obs.] --Tatler.
[1913 Webster]

2. (R. C. Ch.) A small volume containing the daily service
for the "little hours," viz., prime, tierce, sext, nones,
vespers, and compline.
[1913 Webster]

3. (Zool.) A diurnal bird or insect.
[1913 Webster]


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.
[1913 Webster]

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.
[1913 Webster]

Ere twice the horses of the sun shall bring
Their fiery torcher his diurnal ring. --Shak.
[1913 Webster]

3. (Bot.) Opening during the day, and closing at night; --
said of flowers or leaves.
[1913 Webster]

4. (Zool.) Active by day; -- applied especially to the eagles
and hawks among raptorial birds, and to butterflies
(Diurna) among insects.
[1913 Webster]

{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}.
[1913 Webster]

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