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.
Origin of gridiron pendulum
First recorded in 1745–55
Words nearby gridiron pendulum
griddle,
griddlebread,
griddlecake,
gride,
gridiron,
gridiron pendulum,
gridiron-tailed lizard,
gridlock,
grief,
grief-stricken,
griefer