Granule

Granule is a generic term used for a small particle or grain. The generic term is used in a lot of contexts.

• Granule (solar physics), visible structures in the photosphere of the Sun arising from activity in the Sun's convective zone
• Granule (cell biology), any of several submicroscopic structures, some with explicable origins, others noted only as cell type-specific features of unknown function
  • "Azurophil granule", a structure characteristic of the azurophil eukaryotic cell type
  • "Chromaffin granule", a structure characteristic of the chromophil eukaryotic cell type
• Martian spherules, spherical granules of material found on the surface of the planet Mars
• A specified particle size of 2–4 millimetres (-1– -2 on the φ scale)