-jə(r) noun
( -s )
1. : a person that plunges: as
a. : diver
b. : a reckless gambler or speculator
c. : an operator of a pusher for moving iron and steel billets into and out of a furnace — called also pusher
d. : a worker who operates the guides on a rod-rolling mill
2. : a device, piece of equipment, or apparatus that functions by plunging or is used in the plunging of something: as
a. : the rod carrying the valves in the inner assembly of an automobile tire valve unit
b.
(1) : a sliding reciprocating piece driven by or against fluid pressure ; especially : a long valveless piston used as a forcer in a force pump, as a ram in a hydraulic press, or in other similar situations
(2) : a piece with a motion more or less like that of a ram or piston (as a device for firing the charge in a cartridge or a contact mine, the dasher of a churn, or the iron core of an electric sucking coil)
c. : a tank in which clay is worked with water to the proper consistence : blunger
d. : the moving member that in molding ceramic or glassware by pressing forces clay or hot glass into shape
e. : a rubber suction cup attached to a wooden handle and used to free plumbing traps and waste outlets of minor obstructions