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| pis·ton [ pístən ] (plural pis·tons) |
noun |
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| Definition: |
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1. metal cylinder sliding within tube: a metal cylinder that slides up and down inside a tubular housing, receiving pressure from or exerting pressure on a fluid, especially one of several in an internal-combustion engine
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2. valve in brass instrument: the valve mechanism in a brass musical instrument that is used to alter its pitch
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| [Early 18th century. Via French< Italian pestone "large pestle" < pestare (see pesto)] |
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