a timepiece or timing device with a special mechanism for ensuring and adjusting its accuracy, for use in determining longitude at sea or for any purpose where very exact measurement of time is required.
any timepiece, especially a wristwatch, designed for the highest accuracy.

1705–15; chrono- + -meter

chronometric [kron-uh-me-trik] , chronometrical, adjective
chronometrically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chronometer (krəˈnɒmɪtə)
a timepiece designed to be accurate in all conditions of temperature, pressure, etc, used esp at sea

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1735, from chrono- "time" + -meter, from Gk. metron "measure."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
chronometer   (krə-nŏm'ĭ-tər)  Pronunciation Key 
An extremely accurate clock or other timepiece. Chronometers are used in scientific experiments, navigation, and astronomical observations. It was the invention of a chronometer capable of being used aboard ship, in 1762, that allowed navigators for the first time to accurately determine their longitude at sea.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The crew saved nothing but what they stood in, and the vessel's papers and chronometer.
And an ytterbium clock has the potential to be even more accurate and stable than the cesium chronometer.
The regular chronometer movement, because of its delicacy, is out of the
  question for rough land or water travel.
The planetary week is not a grand chronometer of celestial movements or a gauge
  of seasonal changes.
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