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pistachio nut
piste
pistil
pistillate
pistol
pistol grip
pistol-whip
pistole
piston
piston ring
piston rod
pistou
pit (1)
pit (2)
pit boss
pit bull terrier
pit committee
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piston

pis·ton [ pístən ] (plural pis·tons)


noun 
Definition:
 
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

2. valve in brass instrument: the valve mechanism in a brass musical instrument that is used to alter its pitch

[Early 18th century. Via French< Italian pestone "large pestle" < pestare (see pesto)]
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