fe2o3

Multiple \Mul"ti*ple\, a. [Cf. F. multiple, and E. quadruple,
   and multiply.]
   Containing more than once, or more than one; consisting of
   more than one; manifold; repeated many times; having several,
   or many, parts.
   [1913 Webster]

   {Law of multiple proportion} (Chem.), the generalization that
      when the same elements unite in more than one proportion,
      forming two or more different compounds, the higher
      proportions of the elements in such compounds are simple
      multiples of the lowest proportion, or the proportions are
      connected by some simple common factor; thus, iron and
      oxygen unite in the proportions {FeO}, {Fe2O3}, {Fe3O4},
      in which compounds, considering the oxygen, 3 and 4 are
      simple multiplies of 1. Called also the {Law of Dalton} or
      {Dalton's Law}, from its discoverer.

   {Multiple algebra}, a branch of advanced mathematics that
      treats of operations upon units compounded of two or more
      unlike units.

   {Multiple conjugation} (Biol.), a coalescence of many cells
      (as where an indefinite number of amoeboid cells flow
      together into a single mass) from which conjugation proper
      and even fertilization may have been evolved.

   {Multiple fruits}. (Bot.) See {Collective fruit}, under
      {Collective}.

   {Multiple star} (Astron.), several stars in close proximity,
      which appear to form a single system.
      [1913 Webster]
    

Bower-Barff process \Bow"er-Barff" proc`ess\ . (Metal.)
   A certain process for producing upon articles of iron or
   steel an adherent coating of the magnetic oxide of iron
   (which is not liable to corrosion by air, moisture, or
   ordinary acids). This is accomplished by producing, by
   oxidation at about 1600[deg] F. in a closed space, a coating
   containing more or less of the ferric oxide ({Fe2O3}) and the
   subsequent change of this in a reduced atmosphere to the
   magnetic oxide ({Fe2O4}).
   [Webster 1913 Suppl.]
    

Ferric \Fer"ric\, a. [L. ferrum iron: cf. F. ferrique. See
   {Ferrous}.]
   Pertaining to, derived from, or containing iron. Specifically
   (Chem.), denoting those compounds in which iron has a higher
   valence than in the ferrous compounds; as, ferric oxide;
   ferric acid.
   [1913 Webster]

   {Ferric acid} (Chem.), an acid, {H2FeO4}, which is not known
      in the free state, but forms definite salts, analogous to
      the chromates and sulphates.

   {Ferric oxide} (Chem.), sesquioxide of iron, {Fe2O3};
      hematite. See {Hematite}.
      [1913 Webster]