One of the mysteries of the English language finally explained.
1Physics. = "quadrupole" 2.
2Electricity. A network or device, especially a balanced filter network, having one pair of input terminals and one pair of output terminals.
Physics. = "quadrupole".
1920s; earliest use found in Proceedings of the Royal Society of London. From quadri- + pole, in senses A. 1 and B. apparently as alteration of quadrupole, quadrupole.
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