quartz-crystal clock

noun

variants or quartz clock

: a clock in which the high uniform piezoelectric vibrations of a quartz crystal induced by current from a constant frequency generator are used to control the rate of a synchronous motor clock

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!