clocker

[klok-er]
noun
1.
a person who times racehorses during tryouts to determine their speed.
2.
an official who times a race.
3.
a person who maintains a record of the flow of traffic, as of visitors to a museum.

Origin:
clock1 + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
clock1 (klɒk)
 
n
1.  digital clock Compare watch a timepiece, usually free-standing, hanging, or built into a tower, having mechanically or electrically driven pointers that move constantly over a dial showing the numbers of the hours
2.  any clocklike device for recording or measuring, such as a taximeter or pressure gauge
3.  the downy head of a dandelion that has gone to seed
4.  an electrical circuit that generates pulses at a predetermined rate
5.  computing an electronic pulse generator that transmits streams of regular pulses to which various parts of the computer and its operations are synchronized
6.  short for time clock
7.  around the clock, round the clock all day and all night
8.  the clock speedometer an informal word for mileometer
9.  (Brit) a slang word for face
10.  against the clock
 a.  under pressure, as to meet a deadline
 b.  (in certain sports, such as show jumping) timed by a stop clock: the last round will be against the clock
11.  put the clock back to regress
 
vb
12.  slang (Brit), (Austral), (NZ) (tr) to strike, esp on the face or head
13.  slang (Brit) (tr) to see or notice
14.  (tr) to record time as with a stopwatch, esp in the calculation of speed
15.  electronics to feed a clock pulse to (a digital device) in order to cause it to switch to a new state
 
[C14: from Middle Dutch clocke clock, from Medieval Latin clocca bell, ultimately of Celtic origin]
 
'clocker1
 
n
 
'clocklike1
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It is the responsibility of the trainer to contact the clocker when they are working a horse.
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