Kerr cell

[kahr, kur]

Kerr cell

[kahr, kur]
noun Physics.
a transparent cell filled with a fluid, usually nitrobenzene, and containing two electrodes placed between two polarizing light filters, suitable for demonstrating the Kerr effect and often used as a high-speed camera shutter.

Origin:
1925–30; see Kerr effect
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Kerr cell is always a great word to know.
So is base unit. Does it mean:
one of the units, as mass, length, time, or electric current, taken as a basis for a system of units in the sciences
the amount of a given fissionable material necessary to sustain a chain reaction at a constant rate
WordNet
kerr cell

noun
optical device consisting of a transparent cell with two electrodes between two polarizing media; passes light only if the two planes of polarization are parallel; used as a high-speed shutter or to modulate a laser beam 
WordNet® 3.0, © 2006 by Princeton University.
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