Definition of idioplasm in English:

idioplasm

Pronunciation /ˈɪdɪə(ʊ)ˌplaz(ə)m/

noun

historical Biology
  • (Nägeli's term for) the special portion of protoplasm in a cell which is supposed to determine the character of the resulting organism.

Origin

Late 19th century; earliest use found in American Naturalist. After German Idioplasma (C. von NägeliMechanisch-physiologische Theorie der Abstammungslehre i. 23.