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chronometer

[kruh-nom-i-ter] /krəˈnɒm ɪ tər/
noun
1.
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.
2.
any timepiece, especially a wristwatch, designed for the highest accuracy.
Origin
1705-1715
1705-15; chrono- + -meter
Related forms
chronometric
[kron-uh-me-trik] /ˌkrɒn əˈmɛ trɪk/ (Show IPA),
chronometrical, adjective
chronometrically, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for chronometric

chronometer

/krəˈnɒmɪtə/
noun
1.
a timepiece designed to be accurate in all conditions of temperature, pressure, etc, used esp at sea
Derived Forms
chronometric (ˌkrɒnəˈmɛtrɪk), chronometrical, adjective
chronometrically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for chronometric

chronometer

n.

1735, from chrono- "time" + -meter. Related: Chronometric.

Online Etymology Dictionary, © 2010 Douglas Harper
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chronometric in Science
chronometer
  (krə-nŏm'ĭ-tər)   
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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