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4 definitions found
 for Pendulum
From The Collaborative International Dictionary of English v.0.48 :

  Hydrometer \Hy*drom"e*ter\, n. [Hydro-, 1 + -meter: cf. F.
     1. (Physics) An instrument for determining the specific
        gravities of liquids, and thence the strength spirituous
        liquors, saline solutions, etc.
        [1913 Webster]
     Note: It is usually made of glass with a graduated stem, and
           indicates the specific gravity of a liquid by the depth
           to which it sinks in it, the zero of the scale marking
           the depth to which it sinks in pure water. Extra
           weights are sometimes used to adapt the scale to
           liquids of different densities.
           [1913 Webster]
     2. An instrument, variously constructed, used for measuring
        the velocity or discharge of water, as in rivers, from
        reservoirs, etc., and called by various specific names
        according to its construction or use, as tachometer,
        rheometer, hydrometer, pendulum, etc.; a current
        gauge. Hydrometric

From The Collaborative International Dictionary of English v.0.48 :

  Pendulum \Pen"du*lum\, n.; pl. Pendulums. [NL., fr. L.
     pendulus hanging, swinging. See Pendulous.]
     A body so suspended from a fixed point as to swing freely to
     and fro by the alternate action of gravity and momentum. It
     is used to regulate the movements of clockwork and other
     [1913 Webster]
     Note: The time of oscillation of a pendulum is independent of
           the arc of vibration, provided this arc be small.
           [1913 Webster]
     Ballistic pendulum. See under Ballistic.
     Compensation pendulum, a clock pendulum in which the effect
        of changes of temperature of the length of the rod is so
        counteracted, usually by the opposite expansion of
        differene metals, that the distance of the center of
        oscillation from the center of suspension remains
        invariable; as, the mercurial compensation pendulum, in
        which the expansion of the rod is compensated by the
        opposite expansion of mercury in a jar constituting the
        bob; the gridiron pendulum, in which compensation is
        effected by the opposite expansion of sets of rods of
        different metals.
     Compound pendulum, an ordinary pendulum; -- so called, as
        being made up of different parts, and contrasted with
        simple pendulum.
     Conical pendulum or Revolving pendulum, a weight
        connected by a rod with a fixed point; and revolving in a
        horizontal circle about the vertical from that point.
     Pendulum bob, the weight at the lower end of a pendulum.
     Pendulum level, a plumb level. See under Level.
     Pendulum wheel, the balance of a watch.
     Simple pendulum or Theoretical pendulum, an imaginary
        pendulum having no dimensions except length, and no weight
        except at the center of oscillation; in other words, a
        material point suspended by an ideal line.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: an apparatus consisting of an object mounted so that it
           swings freely under the influence of gravity

From Moby Thesaurus II by Grady Ward, 1.0 :

  69 Moby Thesaurus words for "pendulum":
     Indian file, array, articulation, bank, buzz, catena, catenation,
     chain, chain reaction, chaining, concatenation, connection,
     consecution, continuum, course, cycle, descent, drone,
     endless belt, endless round, file, filiation, gamut, gradation,
     hum, line, lineage, metronome, monotone, nexus, oscillator,
     periodicity, plenum, powder train, progression, queue, range, rank,
     recurrence, reticulation, rocker, rocking chair, rocking stone,
     rotation, round, routine, row, run, scale, seesaw, sequence,
     series, shuttle, shuttlecock, single file, spectrum, string,
     succession, swath, swing, teeter, teeter-totter, teeterboard,
     teetery-bender, thread, tier, train, vibrator, windrow

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