| particle [`pärd·ǝ·kǝl] MECHANICS See <<material particle>> PARTICLE PHYSICS See <<elementary particle>> PHYSICS 1. Any very small part of matter, such as a molecule, atom, or electron. Also known as fundamental particle. 2. Any relatively small subdivision of matter, ranging in diameter from a few angstroms (as with gas molecules) to a few millimeters (as with large raindrops). |