[ kruh-nom-i-ter ]
/ krəˈnɒm ɪ tər /


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

First recorded in 1705–15; chrono- + -meter

OTHER WORDS FROM chronometer

chron·o·met·ric [kron-uh-me-trik], /ˌkrɒn əˈmɛ trɪk/, chron·o·met·ri·cal, adjectivechron·o·met·ri·cal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for chronometer

British Dictionary definitions for chronometer

/ (krəˈnɒmɪtə) /


a timepiece designed to be accurate in all conditions of temperature, pressure, etc, used esp at sea

Derived forms of chronometer

chronometric (ˌkrɒnəˈmɛtrɪk) or chronometrical, adjectivechronometrically, 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

Scientific definitions for chronometer

[ krə-nŏmĭ-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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.