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1. An instrument other than a watch for measuring or indicating time, especially a mechanical or electronic device having a numbered dial and moving hands or a digital display.
2. A biological clock.
v. clocked, clocking, clocks
To register or record with a mechanical device: clocked the winds at 60 miles per hour.

clock′er n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


A gene on chromosome 4q12 that encodes a ubiquitously expressed human homolog of the mouse clock gene, which forms a heterodimer with ARNTL and activates E-box element transcription of several circadian clock proteins (e.g., PER1 and PER2). CLOCK is highly expressed in the suprachiasmatic nucleus.

Molecular pathology
CLOCK-ARNTL double mutations in the PAS domains result in syngernistic desensitisation to high levels of CRY on repression of CLOCK-ARNTL transcriptional activity of PER1, disrupting circadian rhythmicity.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


A device for measuring time.

biological clock

1. An internal system in organisms that influences behavior in a rhythmic manner. Functions such as growth, feeding, secretion of hormones, the rate of drug action, the wake-sleep cycle, the menstrual cycle, and reproduction coincide with certain external events such as day and night, the tides, and the seasons. Biological clocks appear to be set by environmental conditions in some animals, but if these animals are isolated from their environment they continue to function according to the usual rhythm. A gradual change in environment does produce a gradual change in the timing of the biological clock. See: circadian; maladaptation to night work; zeitgeber
2. A colloquial term for the decrease in fertility that accompanies aging, particularly as women approach the age of 35.
Medical Dictionary, © 2009 Farlex and Partners

Patient discussion about clock

Q. How do you wake up in the morning if your narcolepsy is so severe you can't hear the alarm clock, phone ring? biggest problem is sleep paralysis, can't wake up. Late for work, everything, life is suffering because of severity. Have tried ritalin, natural supplements, hypnosis therapy, Provigal, antidepressants, nothing seems to work. Employer thinks it's an excuse, friends are irritated, I'm at my wits end. Life is spent sleeping more than awake.

A. Narcolepsy cannot yet be cured. But EDS and cataplexy, the most disabling symptoms of the disorder, can be controlled in most patients with drug treatment. Often the treatment regimen is modified as symptoms change. For decades, doctors have used central nervous system stimulants-amphetamines such as methylphenidate, dextroamphetamine, methamphetamine, and pemoline-to alleviate EDS and reduce the incidence of sleep attacks. For most patients these medications are generally quite effective at reducing daytime drowsiness and improving levels of alertness. However, they are associated with a wide array of undesirable side effects so their use must be carefully monitored. Common side effects include irritability and nervousness, shakiness, disturbances in heart rhythm, stomach upset, nighttime sleep disruption, and anorexia. For full article: Hope this helps.

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References in periodicals archive ?
This states, as I am sure you know, that action and reaction are equal and opposite, so a clockwise rotation of a microwave will include an anticlockwise rotation in the Earth.
Eitzen Maritime Services received its holding in Clockwise in connection with its acquisition of the Spanish ship supply company Provimar in 2007 and the divestment reflects Eitzen Maritime Services' strategy to develop its Ship Supply division into a pure-play global maritime supply organisation, the company said.
Additional benefits include pulse and direction with electronic gearing, encoder following with electronic gearing, clockwise and counter clockwise pulse and the ability to host interface while executing internal programs.
Side-to-side variation, front and back, rock step in place, clockwise and counterclockwise movement.
Clockwise from above: Grand Prize Winner "Red Light" * "Universal" * "If We Had a Photo Booth"
Additional benefits include pulse and direction with electronic gearing, encoder following with electronic gearing, clockwise and counter clockwise pulse, as well as the ability to host interface while executing internal programs.
Clockwise from main, John Dunn (Eaton Mess Group), Colin Meers (Russell Meers), Stuart Russell (Russell Meers), Claire Dunn (Eaton Mess Group); Lynn and John Ollerton (Edward Jones) Sheila Goode, Nicky Thomas and Erica Guise; Dr and Mrs Fisher; Thomas Guise; Clockwise from above, The Nutshell Marketing team; Lisa Soley (HSBC), Sue Lewis (Barclays), Roger Owen-Jones (Barclays), Carol Jones (Barclays); Paul Wilde (Paul Wilde Land), Gary Cowley (Sucking Waddington), Derek Wood (Derek Wood Consultancy; In tomorrow's Post: Birchfield Community School back in class
Up to 40 LEDs can be directed either clockwise or counter clockwise simply by rotating the ring-right's mouse control.
CLOCKWISE FROM TOP LEFT: Typical van sandwich, 2005; Taking trips means making friends, Spain 2002; Geoff and French Fred on the night Geoff got slipped a mickey, Tucson 2005; Bad-headed freakout, Carbondale 2004
as a series of squared-off megaships maneuvered past with azimuth- and thruster-enhanced agility...." Since azimuth is the direction of a celestial object measured clockwise around the observer's horizon from the north, it has nothing to do with a ship's agility to maneuver.
(The temperature was kept at 120[degrees]C throughout the experiments.) The specimens were twisted clockwise up to a strain value at a constant strain rate of 2.4 X [10.sup.-4] (1/s).