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| 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 |
| 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 |