The Collaborative International Dictionary of English v.0.48:

karyoplasm \kar`y*o*plas"m\ (k[a^]r`[i^]*[-o]*pl[a^]z"'m),
karyoplasma \kar`y*o*plas"ma\(k[a^]r`[i^]*[-o]*pl[a^]z"m[.a]),
   n. [NL., fr. Gr. ka`ryon a nut + pla`sma a thing molded.]
   (Biol.)
   The protoplasmic substance of the nucleus of a cell;
   nucleoplasm; -- in opposition to cytoplasm, the protoplasm
   of the cell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

karyoplasm
    n 1: the protoplasm that constitutes the nucleus of a cell [syn:
         nucleoplasm, karyoplasm]