• WordNet 3.6
    • n plunger mechanical device that has a plunging or thrusting motion
    • n plunger hand tool consisting of a stick with a rubber suction cup at one end; used to clean clogged drains
    • n plunger someone who dives (into water)
    • n plunger someone who risks losses for the possibility of considerable gains
    • ***
Webster's Revised Unabridged Dictionary
    • Plunger (Pottery) A boiler in which clay is beaten by a wheel to a creamy consistence.
    • Plunger A long solid cylinder, used, instead of a piston or bucket, as a forcer in pumps.
    • Plunger One who bets heavily and recklessly on a race; a reckless speculator.
    • Plunger One who, or that which, plunges; a diver.
    • Plunger (Gun) The firing pin of a breechloader.
    • ***
Century Dictionary and Cyclopedia
    • n plunger One who or that which plunges.
    • n plunger A cavalryman; in the plural, cavalry.
    • n plunger A reckless better; a dashing or venturesome gambler or speculator.
    • n plunger A part of a machine or piece of mechanism that plunges. The piston of a Cornish pump. It is a cylindrical mass of iron which plays through a stuffing-box up and down in the plunger-case, and forces the water into the lift or tube, in which it rises to the surface, adit-level, or other desired point
    • n plunger In pottery, a vessel in which clay is beaten by a wheel to the required consistency.
    • ***
Chambers's Twentieth Century Dictionary
    • n Plunger one who plunges: a diver: a long solid cylinder used as a forcer in pumps:
    • n Plunger (mil.) a cavalry-man: one who bets heavily
    • ***


Chambers's Twentieth Century Dictionary
O. Fr. plonger—L. plumbum, lead.


In literature:

Where are they now, these Klondike Kings, these givers of champagne baths, these plungers of the gold-camp?
"The Trail of '98" by Robert W. Service
A piece of fine iron wire is connected to the lower end of the plunger to form a fuse for igniting the sample.
"Steam, Its Generation and Use" by Babcock & Wilcox Co.
It's the plungers, not the plodders, who make big winnings.
"The Fighting Shepherdess" by Caroline Lockhart
You will notice the two compartments can be separated by an air-tight plunger, fitting into the aperture between them.
"Pharaoh's Broker" by Ellsworth Douglass
They live on, fighting, singing, lucky as plungers.
"American Poetry, 1922" by Edna St. Vincent Millay
By instinct a plunger, his daring deals became the theatrical talk of the country.
"Charles Frohman: Manager and Man" by Isaac Frederick Marcosson and Daniel Frohman
A moment later he drove one of the remaining kwil needles through the cloth of Duomart's uniform, and rammed the plunger down.
"The Star Hyacinths" by James H. Schmitz
Plunger Churn, late 19th century.
"Agricultural Implements and Machines in the Collection of the National Museum of History and Technology" by John T. Schlebecker
This may be of the plunger type shown in Fig.
"Steam Turbines" by Hubert E. Collins
A vacuum forms under the piston, or plunger, and water rises up the barrel to fill it.
"How it Works" by Archibald Williams

In news:

Police say he threatened the tellers with the plunger .
The plunger was recovered inside Citizen's Bank.
Press the two plunger cups together.
Attempt to separate the plunger cups.
The rest of the afternoon is spent trading stories with other plungers and trying to stay warm — a beer or two helps.
For the plungers and barrels in one series of syringes, the company uses polycarbonate as a durable alternative to polyolefins.
Plunger Assemblies Allow for Quick Repositioning of Equipment Without Tools.
I was using the plunger when the little girl came in and saw me.
Toilet Plunger Is the Model For Device to Restart Hearts.
Cat Pumps announces new triplex plunger pump .
Other features of the 3DX include exclusive concentric, solid-ceramic plungers.
Cat Pumps announces new triplex plunger pump.
2 men beaten with toilet plunger in Flint, police say.
2 men beaten with toilet plunger in Flint.
(AP) — Police say two men reported they were beaten with a toilet plunger during an attack at a Flint home.

In science:

Bright lines of high conductance exhibit a nonlinear dependence on both plunger gates, typical for the stability diagram of a double QD . Black lines emphasize the two apparent slopes of these resonances, each corresponding to the charging line of one of the two QDs.
Laterally defined freely suspended quantum dots in GaAs/AlGaAs heterostructures
The strong Coulomb interaction between electrons blocks the continuous flow of current through the device until nearby plunger gates lower the energy cost of tunneling through both quantum dots.
Gigahertz quantized charge pumping in graphene quantum dots
Many aspects of the design of the Roman pots, including the stainless plunger vessel and the scintillating fibre detectors, are adaptations of the existing proton spectrometer, FPS 3 , installed and operational in H1 since 1994.
Proposal for a Very Forward Proton Spectrometer in H1 after 2000
Indeed because in practice lateral plunger gates are used rather than the kind of “universal” ones assumed above, the quantum dots are affected asymmetrically by the gates, and gate effects turns out to be stronger than scrambling.
Many-Body Physics and Quantum Chaos
The transmission amplitude and phase T = |T |eiα of electrons passing through a quantum dot embedded in an Aharonov-Bohm geometry showed a series of peaks in |T | as a function of a plunger gate voltage Vg shifting the dot’s single-particle energy levels.
Charge transport through single molecules, quantum dots, and quantum wires