A granular material is a conglomeration of discrete solid, macroscopic particles characterized by a loss of energy whenever the particles interact (the most common example would be friction when grains collide).Duran, J., Sands, Powders, and Grains: An Introduction to the Physics of Granular Materials (translated by A. Reisinger).

Thin, dense layer of cells.

Cell with grain-like cytoplasmic appearance.

Sound synthesis method using grains.

Crushed limestone with small particles.