gridiron pendulum

noun

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.

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Origin:
1745–55

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Gridiron pendulum is always a great word to know.

So is quincunx. Does it mean:

a fool or simpleton; ninny.

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

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