granule

Etymology

Borrowed from Late Latin granulum, diminutive of Latin granum (“grain”); for more, see grain; comparable with a surface analysis of grain + -ule.

noun

  1. A tiny grain, a small particle.
  2. (biology) A small structure in a cell.
  3. (geology) A particle from 2 to 4 mm in diameter, following the Wentworth scale
  4. (astronomy) a small mark in the photosphere of the sun caused by convection currents. See also Wikipedia:Granule (solar physics).

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