- 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.
Origin of chronometer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for chronometrical
At the age of 25 he employed his whole time in chronometrical improvements.Curious Epitaphs
Brazil, in order to complete the chronometrical measurement of the world.A Naturalist's Voyage Round the World
But beyond that, in the summer of 1833 he was employed by the Russian Government on a chronometrical expedition in the Baltic.Historic Oddities
To turn the left cheek if the right be smitten, is chronometrical; hence, no average son of man ever did such a thing.
To give all that thou hast to the poor, this too is chronometrical; hence no average son of man ever did such a thing.
- a timepiece designed to be accurate in all conditions of temperature, pressure, etc, used esp at sea
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
Word Origin and History for chronometrical
Online Etymology Dictionary, © 2010 Douglas Harper
- 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.