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WordReference Random House Unabridged Dictionary of American English © 2024slide′ rule′, - Mathematicsa device for performing mathematical calculations, consisting essentially of a ruler having a sliding piece moving along it, both marked with graduated, usually logarithmic, scales: now largely replaced by the electronic calculator.
- 1875–80 for current sense 1655–65 for earlier sense
Collins Concise English Dictionary © HarperCollins Publishers:: slide rule n obsolete - a mechanical calculating device consisting of two strips, one sliding along a central groove in the other, each strip graduated in two or more logarithmic scales of numbers, trigonometric functions, etc. It employs the same principles as logarithm tables
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