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From The Collaborative International Dictionary of English v.0.48:
Idioplasma \Id`i*o*plas"ma\, n. [NL., fr. Gr. 'i`dios 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. [1913 Webster]