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pendulum watch

American

noun

(formerly) a watch having a balance wheel, especially a balance wheel bearing a fake pendulum bob oscillating behind a window in the dial.

Etymology

Origin of pendulum watch

First recorded in 1655–65

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.