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Atmos clock

American  
[at-muhs] / ˈæt məs /
Trademark.

  1. a brand of self-winding clock utilizing variations of temperature acting on a mercury thermometer to create an imbalance within the winding drum.

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