Definition of idioblast in US English:



  • 1Botany. A plant cell having a distinctly different nature or contents from those of the surrounding tissue.

  • 2Biology. Hertwig's term for: a hypothetical unit of living protoplasm involved in heredity. Now historical and rare.

  • 3Geology. A mineral crystal within a metamorphic rock which has developed its own characteristic crystal faces.


Late 19th century; earliest use found in Sydney Vines (1849–1934), botanist. From German Idioblast from Idio- + -blast.