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8 Words That Are Older Than You Think

gridiron pendulum

noun
1.
a clock pendulum having, as part of its shaft, an arrangement of brass and steel rods having different coefficients of expansion, such that the pendulum has the same length at any temperature.
Origin
1745-1755
1745-55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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