chronograph

UK: /ˈkrɒnəˌɡrɑːf/ US: (kron′ə graf′, -gräf′)

WordReference Random House Unabridged Dictionary of American English © 2025

chron•o•graph  (kron′ə graf′, -gräf′), n. 

1. Time a timepiece fitted with a recording device, as a stylus and rotating drum, used to mark the exact instant of an occurrence, esp. in astronomy.
2. Time 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.

v.t. 

3. Time to time by means of a chronograph.

• 1655–65; chrono- + -graph

chro•nog•ra•pher  (krə nog′rə fər), n.  chron•o•graph•ic  (kron′ə graf′ik), adj.  chron′o•graph′i•cal•ly, adv. 
chro•nog′ra•phy, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

chronograph / ˈkrɒnəˌɡrɑːf -ˌɡræf ˈkrəʊnə-/ noun

1. an accurate instrument for recording small intervals of time
2. any timepiece, esp a wristwatch designed for maximum accuracy

chronographer / krəˈnɒɡrəfə/ noun

chronographic / ˌkrɒnəˈɡræfɪk/ adjective

ˌchronoˈgraphically adverb