Source : Webster's Revised Unabridged Dictionary (1913)

Seraphim \Ser"a*phim\, n.
   The Hebrew plural of {Seraph}. Cf. {Cherubim}.

   Note: The double plural form seraphims is sometimes used, as
         in the King James version of the Bible, --Isa. vi. 2
         and 6.

Seraph \Ser"aph\, n.; pl. E. {Seraphs}, Heb. {Seraphim}. [Heb.
   ser[=a]phim, pl.]
   One of an order of celestial beings, each having three pairs
   of wings. In ecclesiastical art and in poetry, a seraph is
   represented as one of a class of angels. --Isa. vi. 2.

         As full, as perfect, in vile man that mourns, As the
         rapt seraph that adores and burns.       --Pope.

   {Seraph moth} (Zo["o]l.), any one of numerous species of
      geometrid moths of the genus {Lobophora}, having the hind
      wings deeply bilobed, so that they seem to have six wings.

Source : WordNet®

seraph
     n : an angel of the first order; usually portrayed as the winged
         head of a child
     [also: {seraphim} (pl)]

seraphim
     See {seraph}