Source : Webster's Revised Unabridged Dictionary (1913)

Nucleoplasm \Nu"cle*o*plasm\, n. [Nucleus + -plasm.] (Biol.)
   The matter composing the nucleus of a cell; the protoplasm of
   the nucleus; karyoplasma.

Source : WordNet®

nucleoplasm
     n : the protoplasm that constitutes the nucleus of a cell [syn:
         {karyoplasm}]