chronograph

[kron-uh-graf, -grahf]
noun
1.
a timepiece fitted with a recording device, as a stylus and rotating drum, used to mark the exact instant of an occurrence, especially in astronomy.
2.
a timepiece capable of measuring extremely brief intervals of time accurately, as a stopwatch able to record fractions of a second as well as elapsed time.
verb (used with object)
3.
to time by means of a chronograph.

Origin:
1655–65; chrono- + -graph

chronographer [kruh-nog-ruh-fer] , noun
chronographic [kron-uh-graf-ik] , adjective
chronographically, adverb
chronography, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chronograph (ˈkrɒnəˌɡrɑːf, -ˌɡræf, ˈkrəʊnə-)
 
n
1.  an accurate instrument for recording small intervals of time
2.  any timepiece, esp a wristwatch designed for maximum accuracy
 
chronographer
 
n
 
chronographic
 
adj
 
chrono'graphically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

chronograph
1868, from chrono- "time" + -graph, from Gk. graphein "to write."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The chronograph is used for the purpose of recording the time of transits of stars as observed with the transit instrument.
Either two or three chronograph stations can be used.
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