The Collaborative International Dictionary of English v.0.48:

Fluid \Flu"id\, n.
   A fluid substance; a body whose particles move easily among
   themselves.
   [1913 Webster]

   Note: Fluid is a generic term, including liquids and gases as
         species. Water, air, and steam are fluids. By analogy,
         the term was sometimes applied to electricity and
         magnetism, as in phrases electric fluid, magnetic
         fluid, though not strictly appropriate; such usage has
         disappeared.
         [1913 Webster +PJC]

   Fluid dram, or Fluid drachm, a measure of capacity equal
      to one eighth of a fluid ounce.

   Fluid ounce.
   (a) In the United States, a measure of capacity, in
       apothecaries' or wine measure, equal to one sixteenth of
       a pint or 29.57 cubic centimeters. This, for water, is
       about 1.04158 ounces avoirdupois, or 455.6 grains.
   (b) In England, a measure of capacity equal to the twentieth
       part of an imperial pint. For water, this is the weight
       of the avoirdupois ounce, or 437.5 grains.

   Fluids of the body. (Physiol.) The circulating blood and
      lymph, the chyle, the gastric, pancreatic, and intestinal
      juices, the saliva, bile, urine, aqueous humor, and muscle
      serum are the more important fluids of the body. The
      tissues themselves contain a large amount of combined
      water, so much, that an entire human body dried in vacuo
      with a very moderate degree of heat gives about 66 per
      cent of water.

   Burning fluid, Elastic fluid, Electric fluid, Magnetic
   fluid, etc. See under Burning, Elastic, etc.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Burning \Burn"ing\, n.
   The act of consuming by fire or heat, or of subjecting to the
   effect of fire or heat; the state of being on fire or
   excessively heated.
   [1913 Webster]

   Burning fluid, any volatile illuminating oil, as the
      lighter petroleums (naphtha, benzine), or oil of
      turpentine (camphine), but esp. a mixture of the latter
      with alcohol.

   Burning glass, a convex lens of considerable size, used for
      producing an intense heat by converging the sun's rays to
      a focus.

   Burning house (Metal.), the furnace in which tin ores are
      calcined, to sublime the sulphur and arsenic from the
      pyrites. --Weale.

   Burning mirror, a concave mirror, or a combination of plane
      mirrors, used for the same purpose as a burning glass.
      [1913 Webster]

   Syn: Combustion; fire; conflagration; flame; blaze.
        [1913 Webster]