Etymology
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chronograph (n.)

"precise time-measuring device," 1831, from chrono- "time" + -graph "instrument for recording; something written." Compare Greek khronographos "recording time and events" (adj.); "a chronicler" (n.). Related: Chronography; chronographic.

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Definitions of chronograph

chronograph (n.)
an accurate timer for recording time;
From wordnet.princeton.edu