particˈulate adjective

Having the form of, or relating to, particles

A particulate substance

particle accelerator noun

A device by means of which the speed of atomic particles may be greatly accelerated

particle beam weapon noun

A weapon whose destructive force consists of a beam of high-energy subatomic particles

par'ticleboard noun (N American)

Same as chipboard (see under chip)

particle physics singular noun

The study of fundamental particles and of fundamental interactions (also called high-energy physics)

particle size noun (geology)

The general dimensions, eg average diameter or volume, of grains in a rock or sediment