The definition of a piston is a sliding valve that is snugly fitted into a cylinder in an engine and which moves up and down because of pressure, or a sliding valve in the cylinder of a brass instrument.
hand tool consisting of a stick with a rubber suction cup at one end; used to clean clogged drains
Any of several diving waterbirds, especially the loon.
One that speculates:
Find another word for plunger. In this page you can discover 4 synonyms, antonyms, idiomatic expressions, and related words for plunger, like: piston, plumber's helper, diver and speculator.