- 1a thing consisting of two or more separate things combined together
- 2 (chemistry) a substance formed by a chemical reaction of two or more elements in fixed amounts relative to each other Table salt is a compound of sodium and chlorine. compare element, mixture
- 3(grammar) a noun, an adjective, or a verb made of two or more words or parts of words, written as one or more words, or joined by a hyphen. Travel agent, dark-haired, and bathroom are all compounds.
- 4an area surrounded by a fence or wall in which a factory or other group of buildings stands a prison compound
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