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3 definitions found
 for alarm clock
From The Collaborative International Dictionary of English v.0.48 :

  Alarm \A*larm"\ ([.a]*l[aum]rm"), n. [F. alarme, It. all' arme
     to arms ! fr. L. arma, pl., arms. See Arms, and cf.
     Alarum.]
     1. A summons to arms, as on the approach of an enemy.
        [1913 Webster]
  
              Arming to answer in a night alarm.    --Shak.
        [1913 Webster]
  
     2. Any sound or information intended to give notice of
        approaching danger; a warning sound to arouse attention; a
        warning of danger.
        [1913 Webster]
  
              Sound an alarm in my holy mountain.   --Joel ii. 1.
        [1913 Webster]
  
     3. A sudden attack; disturbance; broil. [R.] "These home
        alarms." --Shak.
        [1913 Webster]
  
              Thy palace fill with insults and alarms. --Pope.
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     4. Sudden surprise with fear or terror excited by
        apprehension of danger; in the military use, commonly,
        sudden apprehension of being attacked by surprise.
        [1913 Webster]
  
              Alarm and resentment spread throughout the camp.
                                                    --Macaulay.
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     5. A mechanical contrivance for awaking persons from sleep,
        or rousing their attention; an alarum.
        [1913 Webster]
  
     Alarm bell, a bell that gives notice on danger.
  
     Alarm clock or watch, a clock or watch which can be so
        set as to ring or strike loudly at a prearranged hour, to
        wake from sleep, or excite attention.
  
     Alarm gauge, a contrivance attached to a steam boiler for
        showing when the pressure of steam is too high, or the
        water in the boiler too low.
  
     Alarm post, a place to which troops are to repair in case
        of an alarm.
        [1913 Webster]
  
     Syn: Fright; affright; terror; trepidation; apprehension;
          consternation; dismay; agitation; disquiet; disquietude.
  
     Usage: Alarm, Fright, Terror, Consternation. These
            words express different degrees of fear at the
            approach of danger. Fright is fear suddenly excited,
            producing confusion of the senses, and hence it is
            unreflecting. Alarm is the hurried agitation of
            feeling which springs from a sense of immediate and
            extreme exposure. Terror is agitating and excessive
            fear, which usually benumbs the faculties.
            Consternation is overwhelming fear, and carries a
            notion of powerlessness and amazement. Alarm agitates
            the feelings; terror disorders the understanding and
            affects the will; fright seizes on and confuses the
            sense; consternation takes possession of the soul, and
            subdues its faculties. See Apprehension.
            [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Clock \Clock\ (kl[o^]k), n. [AS. clucge bell; akin to D. klok
     clock, bell, G. glocke, Dan. klokke, Sw. klocka, Icel. klukka
     bell, LL. clocca, cloca (whence F. cloche); al perh. of
     Celtic origin; cf. Ir. & Gael. clog bell, clock, W. cloch
     bell. Cf. Cloak.]
     1. A machine for measuring time, indicating the hour and
        other divisions; in ordinary mechanical clocks for
        domestic or office use the time is indicated on a
        typically circular face or dial plate containing two
        hands, pointing to numbers engraved on the periphery of
        the face, thus showing the hours and minutes. The works of
        a mechanical clock are moved by a weight or a spring, and
        it is often so constructed as to tell the hour by the
        stroke of a hammer on a bell. In electrical or electronic
        clocks, the time may be indicated, as on a mechanical
        clock, by hands, but may also be indicated by direct
        digital readout, with the hours and minutes in normal
        Arabic numerals. The readout using hands is often called
        analog to distinguish it from the digital readout. Some
        clocks also indicate the seconds. Clocks are not adapted,
        like the watch, to be carried on the person. Specialized
        clocks, such as atomic clocks, may be constructed on
        different principles, and may have a very high precision
        for use in scientific observations.
        [1913 Webster +PJC]
  
     2. A watch, esp. one that strikes. [Obs.] --Walton.
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     3. The striking of a clock. [Obs.] --Dryden.
        [1913 Webster]
  
     4. A figure or figured work on the ankle or side of a
        stocking. --Swift.
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     Note: The phrases what o'clock? it is nine o'clock, etc., are
           contracted from what of the clock? it is nine of the
           clock, etc.
           [1913 Webster]
  
     Alarm clock. See under Alarm.
  
     Astronomical clock.
        (a) A clock of superior construction, with a compensating
            pendulum, etc., to measure time with great accuracy,
            for use in astronomical observatories; -- called a
            regulator when used by watchmakers as a standard for
            regulating timepieces.
        (b) A clock with mechanism for indicating certain
            astronomical phenomena, as the phases of the moon,
            position of the sun in the ecliptic, equation of time,
            etc.
  
     Electric clock.
        (a) A clock moved or regulated by electricity or
            electro-magnetism.
        (b) A clock connected with an electro-magnetic recording
            apparatus.
  
     Ship's clock (Naut.), a clock arranged to strike from one
        to eight strokes, at half hourly intervals, marking the
        divisions of the ship's watches.
  
     Sidereal clock, an astronomical clock regulated to keep
        sidereal time.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  alarm clock
      n 1: a clock that wakes a sleeper at some preset time [syn:
           alarm clock, alarm]

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