Webster’s Revised Unabridged Dictionary · 1913
Idioplasma
Id′i·o·plas′ma, n. [NL., fr. Gr. ἴδιος proper, peculiar + πλάσμα 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.