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fluid, any substance that is able to flow. Of the four states of matter, only a solid is not a fluid, since it has a definite shape that is not readily changed. Any liquid, gas, or plasma is classed as a fluid.
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An aggregate of matter in which the molecules are able to flow past each other without limit and without fracture planes forming.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
1. a substance, such as a liquid or gas, that can flow, has no fixed shape, and offers little resistance to an external stress
2. capable of flowing and easily changing shape
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005