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1. unwanted variations in a signal that result from imperfections in transmission; see also signal-to-noise ratio.
2. any disturbance in a visual signal being recorded in radiography; see also mottle.


1. Unwanted sound, particularly a complex sound that lacks a musical quality because its various frequencies that comprise it are not whole-or-partial number multiples (harmonics) of each other. Compare: harmony.
2. Unwanted additions to a signal not arising at its source; for example, the 60-cycle frequency wave in an electrocardiogram; largely eliminated from machines after 1980 (includes visual noise on imaging studies).
3. Extraneous uncontrolled variables influencing the distibution of measurements in a set of data.


random signals or disturbances that interfere with the normal flow of data through pathways of computers and other electronic devices.


Random variation in signals of the electromagnetic spectrum that carries no useful information from the source.

A term defined in MRI as an undesirable background signal interference or other disturbance, which affects image quality.

Occupational medicine
OSHA requires that anyone with occupational exposure to greater than 89 decibels should wear ear protection.


Electronics Random variation in signals of the electromagnetic spectrum that carries no useful information from the source. See Cymatics, Music therapy, Sound therapy Technology Poisson noise Fluctuation in the number of information carriers–photons, electrons, which appears as 'snow' in a cathode ray tube, a function of the statistical variation of the rays received by the detector and number of electrons produced by the photomultiplier. See White noise. Cf Chaos, Pink noise.


1. Unwanted sound, particularly complex sound that lacks a musical quality because the various frequencies of which it is composed are not whole or partial number multiples (harmonics) of each other.
2. Unwanted additions to a signal not arising at its source; includes visual noise on imaging studies.
See: signal:noise ratio
3. Extraneous uncontrolled variables influencing the distibution of measurements in a set of data.
[M.E., fr. O.Fr., fr. L.L. nausea, seasickness]


1. a loud, harsh and objectionable sound.
2. interference in an ecological or electronic system, but insufficient to stop the system.
3. in statistics when extraneous, uncontrolled variables cause errors in the distribution of data.

noise pollution
noise in the environment that adversely affects, in our context, the animal inhabitants. No such ill effects have been demonstrated.

Patient discussion about noise

Q. what causes the sound of cracking noises in the head all the time it was said i had acute sinusitis but honestly i think it is more . I don't know why i have cracking noises in my head . I am very concerned about this also my neck is always stiff feeling and aching all the time. . My eyes are very tired and i see blue spots and they hurt behind the eye very badly . I have headaches very often

A. wow...that really sounds serious...i have chronic sinusitis and i can tell you i had horrible headaches but nothing like you describe now. i would strongly consider going to a hospital and checking it out...
tell us what was the result!

Q. Tinnitus (Ringing and Other Ear Noise) Anybody have this problem? Urrrrrrrrrrr, I think I want to shoot myself,you know what I mean. It is worst than the chinese torture. Someone, please send me a good tip how to stop it. I have this for 4 yrs and it is driving me crazy. You cannot enjoy total complete silence. They say silence is golden but not when you have this ringgi in your ears. It gets worst when there is no noise. The only remedy I have is eating hot spicy curry, it helps for 2-3 wks and then it comes back again and then eating spicy food again. Listening to classical music helps to. Oh well.....just have to suck it up.

A. I've read that lipoflavinoids can help.

Q. what can cause a migrane other than light, noise, andno sleep? Well its been 4 days n 3 nights that I have it n it dont go away it was bad at first but then my right ear hurted as well as my right upper wisdomteeth It seems to be in only the right side and its been movin down towards my neck... Please if u have any info on wha the fuck is goin on with me let me know asap...

A. A migraine attack can be triggered also by caffeine consumption, alcohol consumption, certain medications, allergic reactions, physical or emotional stress, smoking, skipping meals, menstrual cycle fluctuations, menopause, and certain food containing-
1) tyramine- red wine, aged cheese, smoked fish, chicken liver, figs and some beans.
2) nitrates - like hot dogs, bacon and salami.

More discussions about noise
References in periodicals archive ?
1 Cry noisily (7) 2 Dubiousness (14) 3 Embedded (6) 4 Pack away (cargo) (4) 5 Boot--shaper (4,4) 6 Most up-t-date (6) 9 Information link (5,9) 10 Look after an empty home (5--3) 15 Building (8) 18 Blameless, guilt-free (20 Fables (7) 21 In a new or different way (6) 23 Contact by phone (4,2) 26 Valley (4) Just send your completed grid, with a note of your name and address, to: Funday Thursday Prize Xword, PO box 901, Glasgow G9 2BD.
Silver buildings glistening in the morning sun, The rain has been and gone, it's daily work is done The sparrows and starlings go noisily berserk A drunken couple, uncoordinated, is that called a twerk?
Compare Birmingham's diminished broadcasting sector with its huge equivalent in Greater Manchester, where civic and business leaders do things more noisily.
The family knew something was amiss as soon as they heard Tia, their pet Shiatsu, barking noisily at the car.
Laker said, 'We have been talking very often and noisily with our institutions about credit standards.
These can be produced faster and less noisily by printers and telefax machines on paper, plastic and other materials, and the addition of colour will allow characters for both blind and sighted persons to be printed on the same document.
Whether racing at high speeds on the overtaking lane, cruising noisily and carelessly in leathers, or food and parcel delivery men in a rush for their next tip, motorcycles are a danger on our roads.
To sum it all up, the tables and chairs were noisily being packed up and put away behind Mr Roddick as he carried out his first TV interview.
Hairy Glasgow mob Kassidy played a noisily catchy set to a three-quarters-full Liquid Room, while at the Bongo Club, Hadouken
How about placing small cubicles throughout the airport to allow convenient seclusion for those pedants who persist in talking loudly on their mobile phones and strutting around noisily, oblivious to others, disturbing everyone's equilibrium as they walk by.
The property is near lights so traffic is not whizzing past noisily.
But the warning about not using your handkerchief noisily is unlikely to cut much ice with any child these days, or even most adults.