Particle
A particle was a small object to which could be ascribed multiple physical or chemical properties such as , density, mass, toxicity, or combustibility. Particles varied in size or quantity, from subatomic particles like electrons, to microscopic particles like atoms and molecules, to larger macroscopic particles like powders and other granular materials or matter like sand.

In 2269, the misty cosmic cloud creature acted like a macromorphase enzyme which would have corroded the hull of the  and the crew would have been broken down into nice digestable particles if the ship's deflector shields didn't stay up. ()

See also 
 Particle accelerator
 Particle beam
 Particle field
 Particle flow
 Particle physics
 Particle synthesis
 Particle weapon
 Particulate

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Particles