資料來源 : pyDict

每日的,一日間的,白天的

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Parallax \Par"al*lax\, n. [Gr. ? alternation, the mutual
   inclination of two lines forming an angle, fr. ? to change a
   little, go aside, deviate; ? beside, beyond + ? to change:
   cf. F. parallaxe. Cf. {Parallel}.]
   1. The apparent displacement, or difference of position, of
      an object, as seen from two different stations, or points
      of view.

   2. (Astron.) The apparent difference in position of a body
      (as the sun, or a star) as seen from some point on the
      earth's surface, and as seen from some other conventional
      point, as the earth's center or the sun.

   {Annual parallax}, the greatest value of the heliocentric
      parallax, or the greatest annual apparent change of place
      of a body as seen from the earth and sun; as, the annual
      parallax of a fixed star.

   {Binocular parallax}, the apparent difference in position of
      an object as seen separately by one eye, and then by the
      other, the head remaining unmoved.

   {Diurnal}, or {Geocentric}, {parallax}, the parallax of a
      body with reference to the earth's center. This is the
      kind of parallax that is generally understood when the
      term is used without qualification.

   {Heliocentric parallax}, the parallax of a body with
      reference to the sun, or the angle subtended at the body
      by lines drawn from it to the earth and sun; as, the
      heliocentric parallax of a planet.

   {Horizontal parallax}, the geocentric parallx of a heavenly
      body when in the horizon, or the angle subtended at the
      body by the earth's radius.

   {Optical parallax}, the apparent displacement in position
      undergone by an object when viewed by either eye singly.
      --Brande & C.

   {Parallax of the cross wires} (of an optical instrument),
      their apparent displacement when the eye changes its
      position, caused by their not being exactly in the focus
      of the object glass.

   {Stellar parallax}, the annual parallax of a fixed star.

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. (Zo["o]l.) 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. (Zo["o]l.) A diurnal bird or insect.

資料來源 : WordNet®

diurnal
     adj 1: 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" [ant: {nocturnal}]
     2: having a daily cycle or occurring every day; "diurnal
        rhythms"; "diurnal rotation of the heavens"; "the diurnal
        slumber of bats"