from The Century Dictionary and Cyclopedia
- n. In a pump, a solid cylindrical piston, either operated by a special piston-rod with a crosshead, or protruding from the pump-barrel sufficiently for the direct attachment of a pitman to it outside of the pump-cylinder.
- n. The solid piston of a pressure-gage, steam-indicator, or some similar instrument. Also called plunger-lift and plunger-bucket.
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