Source : Webster's Revised Unabridged Dictionary (1913)

Idioplasma \Id`i*o*plas"ma\, n. [NL., fr. Gr. ? proper, peculiar
   + ? a form, mold.] (Biol.)
   That portion of the cell protoplasm which is the seat of all
   active changes, and which carries on the function of
   hereditary transmission; -- distinguished from the other
   portion, which is termed nutritive plasma. See {Hygroplasm}.