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1. A fissure.
Farlex Partner Medical Dictionary © Farlex 2012


Substance abuse A 'free-base' form of cocaine which, when smoked in a pipe, produce a brief, very intense 'high'. See Bingeing, Cocaine, Crack 'smile. ', Free base cocaine.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


1. A fissure.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


A highly purified form of COCAINE which produces an intense reaction of rapid onset. Crack is inherently more dangerous than less concentrated forms and deaths have resulted from its use.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


A fissure.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about crack

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. anyone knows how to stop hard skin on the feet from becoming cracked??? during summer my feet got lots of hard skin and in the heel area the skin actually got cracked kinda deep. it hurts now and the cracks are starting to get infected I guess... do u guys know how to solve this?? I know there are some creams for that but I thought maybe now it's too late for that and I need something stronger?

A. There are good creams for moisterizing the skin of your feet on a daily basis, however now that you feel they might be infected you should see a dermatologist for some better treatment.

Q. Im only 17 I have horrble lower back pains. Im constitly rubbing,stretching, or cracking my back. the pain is either a throbbing pain or an ache or sting.I feel it worse when I put my chest out my shoulders back. my back feels like its out of place.

A. Lower back pain is so very common... I have had it for years, and just recently what I found to be very helpful is walking. Even a 30-45 minute walk and then some streching is good. I have hardly had any pain since I started exercising and it feels really good. Swimming is also known to help.

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References in periodicals archive ?
Random cracking often results from mechanical abuse.
The losses in tensile strength and elongation after ozone exposure were undoubtedly minimized by the careful cutting of the tensile test specimens from areas that showed no visible cracking. Overall, the variability in the performance of the three brands of latex condoms likely reflects the different compounds used as antioxidants or antiozonants in individual proprietary formulas.
Figure 4 depicts the cracking sequence on the surface of the specimen from initiation to final failure with the preexisting flaw specimen under loading case I (case 1).
Researchers identified the effects of slab properties, base type, traffic volume, and environmental factors on the occurrence and extent of longitudinal and transverse cracking from a simple analysis of the raw cracking data.
It may be because that the heat transferred into the interior of oil shale, and thermal cracking happened violently.
The model also assumes the behavior of the cracked material as a continuum, the material is considered isotropic before cracking, and orthotropic prior to the development of cracks.
People study the expansive soil cracking mechanizations using mechanics principle and derivate and establish the calculation model of crack depth, but all of the models are directed against the crack initial depth.
There's an easy way to protect the cover from cracks: If you're loading, unloading, or clearing the M240H while the rotor is turning, you must maintain control of the cover so it can't be pushed to the cracking point by rotor wash.
"This cracking is not related to the turbulence, or specific to Qantas, but is traced back to a manufacturing issue," the Qantas statement said, adding that Airbus had confirmed the cracks had no effect on flight safety.
Designers say modern aircraft allow loads to be carried by a different part of the structure when one part fails and most cracking is usually captured early without generating publicity.
"You have to properly identify the extent and cause of cracking before you can implement the right repair solution," he added.