Source : Webster's Revised Unabridged Dictionary (1913)

Infernal \In*fer"nal\, a. [F. infernal, L. infernalis, fr.
   infernus that which lies beneath, the lower. See {Inferior}.]
   1. Of or pertaining to or suitable for the lower regions,
      inhabited, according to the ancients, by the dead;
      pertaining to Pluto's realm of the dead, the Tartarus of
      the ancients.

            The Elysian fields, the infernal monarchy. --Garth.

   2. Of or pertaining to, resembling, or inhabiting, hell;
      suitable for hell, or to the character of the inhabitants
      of hell; hellish; diabolical; as, infernal spirits, or
      conduct.

            The instruments or abettors in such infernal
            dealings.                             --Addison.

   {Infernal machine}, a machine or apparatus maliciously
      designed to explode, and destroy life or property.

   {Infernal stone} (lapis infernalis), lunar caustic; formerly
      so called. The name was also applied to caustic potash.

   Syn: Tartarean; Stygian; hellish; devilish; diabolical;
        satanic; fiendish; malicious.

Machine \Ma*chine"\, n. [F., fr. L. machina machine, engine,
   device, trick, Gr. ?, from ? means, expedient. Cf.
   {Mechanic}.]
   1. In general, any combination of bodies so connected that
      their relative motions are constrained, and by means of
      which force and motion may be transmitted and modified, as
      a screw and its nut, or a lever arranged to turn about a
      fulcrum or a pulley about its pivot, etc.; especially, a
      construction, more or less complex, consisting of a
      combination of moving parts, or simple mechanical
      elements, as wheels, levers, cams, etc., with their
      supports and connecting framework, calculated to
      constitute a prime mover, or to receive force and motion
      from a prime mover or from another machine, and transmit,
      modify, and apply them to the production of some desired
      mechanical effect or work, as weaving by a loom, or the
      excitation of electricity by an electrical machine.

   Note: The term machine is most commonly applied to such
         pieces of mechanism as are used in the industrial arts,
         for mechanically shaping, dressing, and combining
         materials for various purposes, as in the manufacture
         of cloth, etc. Where the effect is chemical, or other
         than mechanical, the contrivance is usually denominated
         an apparatus, not a machine; as, a bleaching apparatus.
         Many large, powerful, or specially important pieces of
         mechanism are called engines; as, a steam engine, fire
         engine, graduating engine, etc. Although there is no
         well-settled distinction between the terms engine and
         machine among practical men, there is a tendency to
         restrict the application of the former to contrivances
         in which the operating part is not distinct from the
         motor.

   2. Any mechanical contrivance, as the wooden horse with which
      the Greeks entered Troy; a coach; a bicycle. --Dryden.
      --Southey. --Thackeray.

   3. A person who acts mechanically or at will of another.

   4. A combination of persons acting together for a common
      purpose, with the agencies which they use; as, the social
      machine.

            The whole machine of government ought not to bear
            upon the people with a weight so heavy and
            oppressive.                           --Landor.

   5. A political organization arranged and controlled by one or
      more leaders for selfish, private or partisan ends.
      [Political Cant]

   6. Supernatural agency in a poem, or a superhuman being
      introduced to perform some exploit. --Addison.

   {Elementary machine}, a name sometimes given to one of the
      simple mechanical powers. See under {Mechanical}.

   {Infernal machine}. See under {Infernal}.

   {Machine gun}.See under {Gun.}

   {Machine screw}, a screw or bolt adapted for screwing into
      metal, in distinction from one which is designed
      especially to be screwed into wood.

   {Machine shop}, a workshop where machines are made, or where
      metal is shaped by cutting, filing, turning, etc.

   {Machine tool}, a machine for cutting or shaping wood, metal,
      etc., by means of a tool; especially, a machine, as a
      lathe, planer, drilling machine, etc., designed for a more
      or less general use in a machine shop, in distinction from
      a machine for producing a special article as in
      manufacturing.

   {Machine twist}, silken thread especially adapted for use in
      a sewing machine.

   {Machine work}, work done by a machine, in contradistinction
      to that done by hand labor.

Source : WordNet®

infernal machine
     n : a bomb that has a detonating mechanism that can be set to go
         off at a particular time [syn: {time bomb}]