- 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 chronometer
We were now questioned about our longitude, and whether we had a chronometer.Ned Myers
James Fenimore Cooper
The captain kept his eyes fixed on the chronometer in his hand.In a Steamer Chair and Other Stories
The chronometer on the mantel was obscured by a thick layer of dust.Cap'n Eri
Joseph Crosby Lincoln
Faces isn't the chronometer to steer your boat to the good ones.Capt'n Davy's Honeymoon
He stood with a strained tautness, staring feverishly at the chronometer.Competition
- 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 chronometer
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.